1.

A body of mass m at rest is subjected to a constant force F for time. The kinetic energy at timet is given by :

Answer»

`F^2 t^2 //2m`
`F^2 t^2 //3M`
`2F^2 t^2 //m`
`F^2 t^2 //m`

SOLUTION :Energy of BODY `E=(p^2)/(2m)`
Now`Deltap="IMPULSE"=F.t`.
`DeltaE=(Deltap^2)/(2m)=(P^2t^2)/(2m)`.


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