Question

A body of mass 50 kg is at rest if it is acted upon by force of 20 N for 4 sec. How much speed will it acquire.

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Answer 1

Explanation:

Impulse on the body would be J−FΔt, where F=20N,t=3s also impulse is change in momentum :J=MΔV

so,

m(v−u)=Ft,m−4kg,u=0m/s gives,

4V=20×3→V=15m/s

Answer 2

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According to Newton's second law,

F= m×a

F=m× v/t

Then from this velocity can be found easily.

Velocity = 20 × 4/50

Velocity = 1.6 m/s.