Question

a car moving with a speed of 25m/s takes a u-turn in 5 seconds , without changing its speed .the average acceleration during these 5 sec

Answer 1

a = v/t


v = constant

therefore , a = 0

Answer 2

Explanation:

Correct answer is

10 ms−1

Velocity is vector quantity so direction matters.

Initial Velocity=25m/s, Final Velocity=−25m/s.

Δv=(−25)−25=−50m/s

Average acceleration =ΔtΔv=550=10ms−2.