Question

A body of mass 2 kg is thrown upward with an initial velocity of 20m/s after 2 sec its kinetic energy will be

Answer 1

First calculate it's velocity after 2 seconds.

$v = u + at \\ v = 20 - 10 \times 2 \\ v = 0$
velocity after 2 seconds will be zero.

so K.E. = 0 After 2 seconds.✔️