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  1. 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/

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  2. 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/

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  3. (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/

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  4. 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/

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  5. 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/

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