Final answer: How fast does the block of wood move after being hit?

[chibichibi7554]

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

 

[berkeman]

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.

 

[m2003]

m/s

I cannot confirm if this is the correct way to solve the problem without knowing all the variables and assumptions made. However, based on the information given, it appears that the block of wood moves at a velocity of 0.25 m/s after being hit. It is also important to consider the conservation of momentum in this scenario, as the total momentum before and after the collision should be equal. Further calculations and analysis may be needed to accurately determine the speed of the block of wood after being hit.