Question

A 1 kg body falls freely under gravity. Find its momentum and kinetic energy 5 seconds after it starts falling. Take $g=10m{s}^{-2}$.

Answer 1

Velocity after $5$ secs , $v=gt=10\times 5=50m/s$

Mass of body , $m=1kg$

Momentum of body , $p=mv=1\times 50=50kgm/s$

Kinetic energy of body , $K=\frac{1}{2}m{v}^2=\frac{1}{2}\times 1\times {50}^2=1250J$