- #1

Molly1235

- 77

- 4

So the problem goes:

"A gun of mass 4.0kg fires a bullet of mass 10g at a speed of 60 m/s. What is the initital speed of recoil of the gun?"

First I thought I would have to convert both masses so they are in the same units, so I converted 4kg to 4000g.

From this thread I took

"(Mass of gun)*(Speed of Gun) = (Mass of Bullet)*(Speed of Bullet)" Please correct me if I am wrong here.

So I substituted in the numbers.

4000*? = 10*60

4000*? = 600

600/4000 = 0.15

Speed of recoil = 0.15 m/s

I have no idea if this is correct, please please give me a pointer in the right direction?

Thanks,

Molly.