Power delivered to a particle varies with time as `P = (3t^(2) - 2t)` watt, where 't' is in seconds, then change in its kinetic energy between time `t = 1` to `t = 3s`.

Options

A. 18 J
B. 24 J
C. 21 J
D. 32.5 J

Answer

A

Explanation

`P=(dW)/(dt)`
`w=int dW= int Pdt = int_1^(3) (3t^2-2t) dt = Delta K.E.`