# Homework Help: AP Physics ~ Momentum ~ A 3.0-kg ball, which is dropped, strikes the ground with a ve

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1. Oct 23, 2012

### Silverbolt

A 3.0-kg ball, which is dropped, strikes the ground with a velocity of 16.0 m/s and rebounds with a velocity of -12.0 m/s. What is the change in momentum?

2. Oct 23, 2012

### Same-same

Re: AP Physics ~ Momentum ~ A 3.0-kg ball, which is dropped, strikes the ground with

Remember the formula for momentum?

3. Oct 23, 2012

### Silverbolt

Re: AP Physics ~ Momentum ~ A 3.0-kg ball, which is dropped, strikes the ground with

p=mv ?

4. Oct 23, 2012

### Same-same

Re: AP Physics ~ Momentum ~ A 3.0-kg ball, which is dropped, strikes the ground with

Yes. Now how does that apply to the problem? If p = mv, what is change in p?

5. Oct 23, 2012

### Silverbolt

Re: AP Physics ~ Momentum ~ A 3.0-kg ball, which is dropped, strikes the ground with

mv final-mv inital

6. Oct 23, 2012

### Same-same

Re: AP Physics ~ Momentum ~ A 3.0-kg ball, which is dropped, strikes the ground with

Yep. Now is momentum a vector quantity? Does the sign matter?