- #1
davedays
- 15
- 0
Homework Statement
A bullet m= 9.0 g leaves the barrel of a rifle with a speed = 8.0 x 10 ^2 ms-1 (by the may I am sure - is this 80 ms-1 ?)
The mass of the rifle = 1.8 kg
The rifle is free to move back
Calculate the speed of recoil
Homework Equations
I figured I would need these :
p=mv
F=mv/t
I'm not sure wether that's all I need.
The Attempt at a Solution
Well, first of all I think that the momentum 1 way = the momentum the other way.so
p1=p2
m1 x v1 = m2 x v2
9 [g] x 80 [ms-1] = 1800 g (1.8 kg right ?) x V2
720 = 1800 V2
V2= 720/1800
V2= 0.4
Is this correct guys ?