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An object of mass 100 kg is accelerated uniformly from a velocity of 5 ms–1 to 8 ms–1 in 6 s. Calculate the initial and final momentum of the object. Also find, the magnitude of the force exerted on the object.
According to question,
m = 100 kg
t = 6 sec
u = 5 m/s
v = 8 m/s
initial momentum = mu
= 100 × 5
= 500 kg-m/s
final momentum = mv
= 100 × 8
= 800 kg-m/s
force exerted on the object = Change in momentum / Time taken
= (800 - 500) / 6
= 300 / 6
= 50N
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