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During a family road trip, you drive 200 km north in three hours. Afterwards, you drive 200 km south in two hours. Find the average speed and average velocity for your entire trip.
The total distance travelled is 200 + 200 = 400 km, while the total time taken is 3 + 2 = 5 hours. Therefore, average speed = 400/5 = 80 km/h. Since the vehicle travels 200 km north and then 200 km south, it returns to the starting point. Hence, displacement is zero and average velocity = 0/5 = 0 kmRead more
The total distance travelled is 200 + 200 = 400 km, while the total time taken is 3 + 2 = 5 hours. Therefore, average speed = 400/5 = 80 km/h. Since the vehicle travels 200 km north and then 200 km south, it returns to the starting point. Hence, displacement is zero and average velocity = 0/5 = 0 km/h.
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 ball rolls down an inclined track as shown in Fig. 4.6. Is its motion, a straight line motion? Assuming the starting point of the ball (O) to be the origin, can its motion from O to D be depicted using a horizontal line as shown in Fig. 4.3? Are the values of total distance travelled and magnitude of displacement from O equal or different at positions A, B, C and D?
Yes, the ball’s motion is straight-line motion because it moves along the straight inclined track from O to D. Taking O as the origin, its motion can be represented using a horizontal line showing its successive positions. Since the ball continuously moves in the same direction without changing itsRead more
Yes, the ball’s motion is straight-line motion because it moves along the straight inclined track from O to D. Taking O as the origin, its motion can be represented using a horizontal line showing its successive positions. Since the ball continuously moves in the same direction without changing its path, the total distance travelled and the magnitude of displacement are equal at positions A, B, C and D.
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 lessFuel used up in a vehicle depends on which of the following? Justify your answer. (i) Total distance travelled (ii) Displacement
Fuel used in a vehicle depends on the total distance travelled rather than its displacement. Fuel is consumed as the vehicle moves through the actual path covered. For example, if a vehicle travels from home to a place and returns home, its displacement is zero, but it has travelled a certain distanRead more
Fuel used in a vehicle depends on the total distance travelled rather than its displacement. Fuel is consumed as the vehicle moves through the actual path covered. For example, if a vehicle travels from home to a place and returns home, its displacement is zero, but it has travelled a certain distance and consumed fuel. Thus, fuel consumption is related to distance travelled, not displacement.
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 a circle, if the distance of chord AB from the centre is twice the distance of another chord CD from the centre, then can we conclude that CD = 2 AB? Give reasons for your answer.
No, we cannot conclude that CD = 2AB. The distance of chord AB from the centre being twice the distance of chord CD does not mean that CD is twice AB. According to Theorem 8, the longer chord is closer to the centre, but the relationship between chord length and distance is not directly proportionalRead more
No, we cannot conclude that CD = 2AB. The distance of chord AB from the centre being twice the distance of chord CD does not mean that CD is twice AB. According to Theorem 8, the longer chord is closer to the centre, but the relationship between chord length and distance is not directly proportional. Chord length also depends on the radius of the circle. Therefore, the given distances alone are not sufficient to establish CD = 2AB.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 5 I’m Up and Down and Round and Round (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-5/
See lessFind the product without multiplying directly: (18 x 29)
To find this product using an identity approach, we can break down both numbers relative to base tens, writing them as the binomial product (20 - 2)(30 - 1). Applying the distributive expansion gives 20 times 30 minus 20 times 1 minus 2 times 30 plus 2 times 1. This evaluates to 600 minus 20 minus 6Read more
To find this product using an identity approach, we can break down both numbers relative to base tens, writing them as the binomial product (20 – 2)(30 – 1). Applying the distributive expansion gives 20 times 30 minus 20 times 1 minus 2 times 30 plus 2 times 1. This evaluates to 600 minus 20 minus 60 plus 2. Solving this basic arithmetic sequence yields 522.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 4 Exploring Algebraic Identities (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-4/
See less