A bullet of mass 10gm is fired from a gun of mass 1kg with a velocity of 100m/s. calculate the ratio of kinetic energy of the bullet and the gun.

Answer 1

start with conservation of energy.
massbullet*velocitybullet=massgun*Vgun
vgun= .010*100 /1kg= ....

Now, ratio of KE
kebullet= 1/2 m v^2= 1/2 (.01)(100^2)
kegun= 1/2 *1*Vbun^2