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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Answers & Comments
u= 10m/s. v= 20m/s. t= 5sec.
So, Acceleration(a) = (v-u)/t
a= (20-10)/5
a= 2m/s^2
So, Magnitude of Force(F)= m×a
F= 4×2
F= 8 Newton....
So, answer is 8 N.
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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.