A body of mass 5kg is moving with a momentum of 10kgm/sec. A force of 0.2n acts on it in the direction of motion of body for 10sec. The increase in kinetic energy?
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Explanation:
initial momentum = 10
initial KE = p^2 / 2m
= 10×10/ 2×5 =10 J
force acts for 10 sec.
F =dp/dt
0.2 = change in p / 10
change in p = 2
final momentum = 10 +2 =12
final KE = p^2 / 2m
= 12 ×12 / 2 ×5 = 14.4 J
change in KE = 14.4 - 10 = 4.4 J
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