Question

A body of 20kg is moving with velocity 10m/s , sudenly acted upon by a force in its direction of motion. Which its speed to 'v' m/s .If the work done by the force on the body is 3000J. Calculate the final velocity 'v'.

Answer 1

KE=w
KE=3000J
$\frac{1}{2} {v}^{2} m = 3000 \\ \frac{1}{2} \times 20 \times {v}^{2} = 3000 \\ {v}^{2} = 300 \\ v = \sqrt{300}$