# Momemtum and cannonballs

1. Jun 29, 2007

### chella

Hey guys, I'm having a little trouble answering this question. At first I thought it was A, but then I started thinking in multiplying and now I"m not sure...

Momentum is inertia in motion, and it is equal to the product of a body's mass and its velocity. For example, if the speed of a projected cannonball is doubled, then the momentum is doubled. if instead the cannonball's mass is doubled, then the momentum is likewise doubled. Suppose, however, that a cannonball's mass is somehow doubled and its velocity is also doubled. Then its momentum is
a) the same
b) doubled
d) none of these

2. Jun 29, 2007

### G01

Try to solve this by substituting some numbers if you can't see it. Say m=2 and v =2. What is the momentum? Now double both. How does the new momentum relate to the old momentum?

3. Jun 29, 2007

### CaptainZappo

The definition of momentum (represented by P) is P = mv.

Apply this knowledge and you should have little to no problem finding the correct answer.