What is the recoil speed of the rifle?

[jazzysoshort]

Homework Statement

Kim holds a 2.0 kg air rifle loosely and fires a bullet of a mass 1.0 g. The muzzle velocity of the bullet is 150 m/s. What is the recoil speed of the rifle?

Homework Equations

p=mv

The Attempt at a Solution

p=(150)(.01) 15=2v
p=15 7.5=v

 

[rock.freak667]

Looks correct. Just note that it is -7.5m/s

 

[Borek]

No, it is not OK. 1.0g is not 0.01kg.

Even assuming it is, 150*0.01 is not 15.

 

[jazzysoshort]

I apologize wasn't what i had on my paper in a bit of rush to see if i was understanding the equation. You are absolutely right 1 g is .001kg and it multiplied by 150 is 1.5, but besides careless errors i just want 2 know am i on the right track

 

[Borek]

General approach seems to be OK