A force of 1000 N acts on a particle parallel to its direction of motion which is horizontal. Its velocity increases from 1 m s –1 to 10 m s –1 , when the force acts through a distance of 4 meter. Calculate the mass of the particle. Given: a force of 10 Newton is necessary for overcoming friction
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(80 kg)
Sol. By work energy theorem,
W F + W f = 
K
⇒ 1000 × 4 – 10 × 4 = 
m (10 2 – 1 2 )
⇒ m = 80 kg.
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