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Linear momentum

I am not sure if I am doing this question right.

A 10g bullet, traveling at 400 m/s hits a block of wood & emerges going at 350 m/s. How fast goes the block of wood move after being hit?

Is this the right way to solve it?:

mv of the bullet + mv of the block = mv' of the bullet + mv' of the block
(.01)(400)+0=(.01)(350)+(2)v
v=.25
 

Answers and Replies

berkeman
Mentor
56,094
6,139
You left the mass of the block out of your problem statement but included it in the work as 2kg (right?). Other than that it looks like a correct application of the conservation of linear momentum. Oh, and be sure to include units on the answer -- many folks (including me) will mark you down for leaving them off.
 

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