Question

A shell of mass 0.04 kg is fired by a gun of mass 120 kg. If the muzzle speed of the shell is 90 m/s, what is the recoil speed of the gun?

Answer 1

Answer:

Mass of gun M = 100kg

mass of shell m = 0.020kg

Velocity of shell v = 80m/s

Recoil velocity of Gun V=?

initial velocities of both gun and shell will be zero

so, the initial momentum of the system will be zero.

According to the law of conservation of momentum,

Initial momentum = Final momentum

so,

0=mv-MV

∴v=mv/M

=

100

0.020×80

=0.016 m/s

∴recoil velocity of Gun=0.016m/s

Answer ByavatarToppr