Question

A bullet of mass 4g when fired with a velocity of 50m/s .Can enter a wall upto a depth of 10cm .How much will be the average resistance after by the wall

Answer 1

Final velocity =0
initial velocity =50m/S
using third equation of motion
$- {u}^{2} = 2as \\ - 2500 = 2 \times a \times 0.1 \\ a = - 12500 \\ force = ma = \frac{4}{1000} \times - 12500 \\ = 50$