A force of 10 N acts on a body of mass 2 kg for 3s,initially at rest. Calculate: (1) the velocity acquired by the body, and(2) change in momentum of the body.
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Force = Mass × acceleration
F = 10 N
mass = 2kg
a = F/m = 10 /2 = 5m/s²
i) now, u = 0
t = 3 sec
v = u + at = 0 + 3×5 m/s
ii) initial momentum = mu= 2×0=2
final momentum = mv = 2×15 = 30 kg m/s
change of momentum = final momentum - initial momentum
= 30 - 0 = 30 kg m/s
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