A force applied on a body of mass 4kg for 5s changes its velocity from 10 m/s to 20m/s . find the power required.
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priyanka9683:
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Power = Work done / Time
Work done is also defined as the change in KE of an object.
As change in KE is 1/2M(Vf^2-Vi^2)
here vf is final velocity
vi is initial velocity.
Change in KE will be 1/2 4 ( 20square-10square)
Time is 5s.
Substitute values to calculate power.
Hope you get your answer.
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