Question

A bullet of mass 20 gram is fire from a rifle with a velocity of 8 metre per second after passing through one boy of thickness 100cm velocity drops 200 m per second what is the average resistance of the world

Answer 1

mass of the bullet(m)=20 gram or 0.02 kg

initial velocity of the bullet(u)=8m/s

final velocity(v)=200m/s

thickness(s)=100 cm or 1 m

we know

v^2=u^2+2as

V^2-u^2=2as

4oooo-64=2a*1

39936/2=a

a=19968m/s^2

now force=mass*acceleration

force=0.02*19968N

resistance=399.36N