Q.

A body of mass 5 kg at rest is acted upon by a force. Its velocity changes to 6 ms–1. Find its initial and final momentum in kg ms-1.

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a

0, 30

b

0, 25

c

30, 0

d

25, 0

answer is A.

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Detailed Solution

Given Mass, m = 5 kg

Initial velocity, u = 0 m s−1

Final velocity, v = 6 m s−1

Initial momentum (p1)

Since the body is at rest, its initial momentum is zero.

( p = mass × velocity)

p1 = 0

Final momentum, (p2)

p2 = mv

p2 = (5 kg) × (6 m s−1) = 30 kg m s−1

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