Question

A body of mass 5 kg has the linear momentum of 100 kg ms-1 and acted upon by the force of 2 N for 2 sec. Then change in kinetic energy in joule is

Answer 1

The Correct answer is 81.6.
F × t = ΔP
⇒ 2 × 2 = $P_f$ – 100
$P_f$= 104 kg ms-1