Momentum question
A bullet of has 20g is fired from a rifle of mass 5.0kg with a speed of 0.40kms^-1. what is the recoil velocity of the rifle?
The answer is meant to be 1.6ms^-1 but i have no idea how to work this out. Thank you.
The answer is meant to be 1.6ms^-1 but i have no idea how to work this out. Thank you.
Momentum before = Momentum after
Momentum of the Bullet = Momentum of the Rifle
Momentum of bullet = 0.02* 0.4x10^3 = 8 kgms^-1
Momentum of rifle = (-)8 kgms^-1 mass of rifle= 5kg p/m=v
8/5 = 1.6 ms^-1
Momentum of the Bullet = Momentum of the Rifle
Momentum of bullet = 0.02* 0.4x10^3 = 8 kgms^-1
Momentum of rifle = (-)8 kgms^-1 mass of rifle= 5kg p/m=v
8/5 = 1.6 ms^-1
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