Question

A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20m/s. What will be its kenetic energy at the end of 2s ? ( Assume g = 10 m/s^2).

Answer 1

velocity after 2 sec:-
by using v=u-at
=v=20-10×2=0
so velocity after to sec=0
$kinetic \: energy = \frac{1m {v}^{2} }{2} \\ = \frac{1 \times 2 \times {0}^{2} }{2} = 0$

so kinetic energy after 2 sec is 0