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## Homework Statement

A 30 kg cannonball strikes a 150 kg stationary wooden block and embeds itself in the block. The block and cannonball move together at 4 m/s. What was the original velocity of the cannonball?

## Homework Equations

m

_{1}v

_{1}=m

_{2}v

_{2}

## The Attempt at a Solution

using the equation i gave i got:

30v=150(4)

v=20

the answer my teacher my teacher gave me was 24 m/s. and i was thinking if you add the '4 m/s' to the velocity i just found it would be '24 m/s'. but i dont know if that was right. i was thinking it might be right because they both moved together after the ball hit the wood for 4 m/s. so is that right? or am i supposed to do something else?

thank you!

sweedeljoseph