Question

A bullet of mass 0.02kg travelling with speed 100m/s comes to rest when it has gone 0.4m into sand. Find the resisting force exerted by the sand

Answer 1

$A=Wk1-Wk2=Wk1; A=F \times S=Wk1=\frac{m\times v^{2}}{2}; F=\frac{m\times v^{2}}{2\times S}=250 N$