Share & grow the world's knowledge!
We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
How much distance should we maintain from the truck ahead to avoid a collision if it suddenly applies the brakes?
A sufficient safe distance should be maintained from the truck so that the following vehicle has enough time and space to react and stop safely if the truck suddenly applies its brakes. The required distance depends on factors such as the vehicle’s speed, driver’s reaction time, road condition and bRead more
A sufficient safe distance should be maintained from the truck so that the following vehicle has enough time and space to react and stop safely if the truck suddenly applies its brakes. The required distance depends on factors such as the vehicle’s speed, driver’s reaction time, road condition and braking capacity. A vehicle travelling at higher speed generally requires a greater safe distance to avoid collision.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-4/
See lessDoes this distance depend upon the speed with which we are moving?
Yes, the safe distance depends on the speed at which we are moving. When the speed of a vehicle increases, it requires more distance to react and stop after the brakes are applied. Therefore, a vehicle travelling at a higher speed should maintain a greater safe distance from the vehicle ahead. ThisRead more
Yes, the safe distance depends on the speed at which we are moving. When the speed of a vehicle increases, it requires more distance to react and stop after the brakes are applied. Therefore, a vehicle travelling at a higher speed should maintain a greater safe distance from the vehicle ahead. This helps provide enough time and distance to avoid a collision.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-4/
See lessIn the example of an athlete running back and forth on a straight track (Fig. 4.4), when will the displacement of the athlete be zero? What will be the total distance travelled in that case?
The displacement of the athlete will be zero when she returns to her starting point O, because her initial and final positions are the same. She runs from O to A, covering 100 m and then returns from A to O, covering another 100 m. Therefore, the total distance travelled is 100 + 100 = 200 m, whileRead more
The displacement of the athlete will be zero when she returns to her starting point O, because her initial and final positions are the same. She runs from O to A, covering 100 m and then returns from A to O, covering another 100 m. Therefore, the total distance travelled is 100 + 100 = 200 m, while the displacement is 0 m.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-4/
See lessMy father went to a shop from home which is located at a distance of 250 m on a straight road. On reaching there, he discovered that he forgot to carry a cloth bag. He came home to take it, went to the shop again, bought provisions and came back home. How much was the total distance travelled by him? What was his displacement from home?
The shop is 250 m from his home. He travelled from home to the shop, returned home to collect the bag, went to the shop again and finally returned home. Thus, total distance travelled = 250 × 4 = 1000 m. Since his final position is the same as his starting position, his displacement from home is 0 mRead more
The shop is 250 m from his home. He travelled from home to the shop, returned home to collect the bag, went to the shop again and finally returned home. Thus, total distance travelled = 250 × 4 = 1000 m. Since his final position is the same as his starting position, his displacement from home is 0 m.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-4/
See lessA student runs from the ground floor to the fourth floor of a school building to collect a book and then comes down to their classroom on the second floor. If the height of each floor is 3 m, find: (i) the total vertical distance travelled and (ii) their displacement from the starting point.
The height of each floor is 3 m. From the ground floor to the fourth floor, the student travels 4 × 3 = 12 m upward. From the fourth floor to the second floor, they travel 2 × 3 = 6 m downward. Therefore, total vertical distance travelled = 12 + 6 = 18 m. The final position is 6 m above the startingRead more
The height of each floor is 3 m. From the ground floor to the fourth floor, the student travels 4 × 3 = 12 m upward. From the fourth floor to the second floor, they travel 2 × 3 = 6 m downward. Therefore, total vertical distance travelled = 12 + 6 = 18 m. The final position is 6 m above the starting point, so displacement = 6 m upward.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-4/
See less