Question

The momentum of a body of mass 4kg is 400 kg m/s. Calculate its kinetic energy.​

Answer 1

Initial velocity (u)=

5

20

=4m/s

Acceleration produced =

m

F

=1m/s

2

Final velocity(v)=u+at=4+1(10)=14

So, Change in K.E =

2

1

m(v

2

−u

2

)=

2

1

(5)(196−16)=450J

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