First slide

Average Acceleration

Question

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

Moderate

A

-2v/t
B

2v/t
C

v/2t
D

t/2v

Solution

v = u + at ⇒ u = + v and v = – v
– v = + v + at ⇒ a = -2v/t

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