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A car starts from rest and its velocity reaches 24 m s⁻¹ in 6 s. Find the average acceleration and the distance travelled in these 6 s.
The initial velocity of the car is u = 0 m s⁻¹, final velocity is v = 24 m s⁻¹ and time is t = 6 s. Average acceleration = (v − u)/t = (24 − 0)/6 = 4 m s⁻². Distance travelled = average velocity × time = [(u + v)/2] × t = [(0 + 24)/2] × 6 = 72 m. For more NCERT Solutions of Class 9 Science ExRead more
The initial velocity of the car is u = 0 m s⁻¹, final velocity is v = 24 m s⁻¹ and time is t = 6 s.
Average acceleration = (v − u)/t = (24 − 0)/6 = 4 m s⁻².
Distance travelled = average velocity × time = [(u + v)/2] × t = [(0 + 24)/2] × 6 = 72 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 girl is riding her scooter and finds that its speedometer reading is constant. Is it possible for her scooter to be accelerating and if so, how?
Yes, it is possible for the scooter to be accelerating even when its speedometer reading remains constant. Acceleration is the rate of change of velocity and velocity depends on both speed and direction. Therefore, if the scooter moves with constant speed but continuously changes its direction, itsRead more
Yes, it is possible for the scooter to be accelerating even when its speedometer reading remains constant. Acceleration is the rate of change of velocity and velocity depends on both speed and direction. Therefore, if the scooter moves with constant speed but continuously changes its direction, its velocity changes and the scooter is accelerating. For example, this occurs when the scooter moves along a circular path.
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 lessUnder what condition(s) is the: (i) magnitude of average velocity of an object equal to its average speed? (ii) magnitude of average velocity of an object zero while its average speed is not zero?
(i) The magnitude of average velocity is equal to average speed when an object travels along a straight-line path without changing its direction, so distance travelled equals the magnitude of displacement. (ii) The magnitude of average velocity can be zero when the object returns to its starting poiRead more
(i) The magnitude of average velocity is equal to average speed when an object travels along a straight-line path without changing its direction, so distance travelled equals the magnitude of displacement.
(ii) The magnitude of average velocity can be zero when the object returns to its starting point. Its displacement is then zero, but its total distance travelled is not zero, so its average speed remains non-zero.
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 lessDuring 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 less