Question

A body starting with a speed 10 m/s returns to its initial position after 4 s with the same speed along the same line. The magnitude of acceleration of the body is

5m/S2
10m/S2
4m/S2
2m/S2
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Answer 1

Answer:

4m/s is the correct answer I think

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I am not that good in phy numerical but I hope it would be write

Answer 2

Answer:

5m/s^2

Explanation:

initial velocity (u)= 10m/s

final velocity(v)= -10m/s as the direction is reversed

v =u+at

-10 = 10 +4a

a = -20/4 = -5