Q.

A body starting with a velocity ‘v’ returns to its initial position after ‘t’ second with the same speed, along the same line. Average acceleration of the particle is

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a

-2v/t

b

2v/t

c

v/2t

d

t/2v

answer is A.

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Detailed Solution

v = u + at ⇒ u = + v and v = – v– v = + v + at ⇒ a = -2v/t
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A body starting with a velocity ‘v’ returns to its initial position after ‘t’ second with the same speed, along the same line. Average acceleration of the particle is