# Momentum questions

1. Jun 13, 2013

### Fresko

1. The problem statement, all variables and given/known data
A pellet is fired from a gun. the Pellet is fired horizontally into the a toy car, which has modelling clay attached to it. The pellet remains in the clay as the car moves.

The car travels a distance of 0.069M before coming to a rest at 1.3s

show that the speed of the car immediately after being struck by the pellet was about 1 m/s

2. Relevant equations

No idea, but it also asks in part 2, the assumption you made in order to apply the equation.

3. The attempt at a solution

my attempt was using the kinematic equations but I reached a value of 0.1 m/s which is no where near 1m/s

2. Jun 13, 2013

### PhanthomJay

using the kinematic equations is the correct approach. I also get your answer. Could be a typo in the book answer.

3. Jun 13, 2013

### Fresko

It cannot be, the value is way off.

4. Jun 13, 2013

### Fresko

Never mind, you are indeed correct and I apologise, I just realised I read the value for distance differently, the kinematic equations gave a value of 1.06m/s which is good enough for me.

However now I have to state an assumption in order to apply the equation I used.

5. Jun 14, 2013

### PhanthomJay

The usual assumptions about under what conditions momentum is considered, you might think of others.