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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