# Problem: a) An 80 kg quarterback jumps straight up in the air right before throwing a 0.43 kg football horizontally at 15 m/s. How fast will he be moving backward just after releasing the ball?b) Suppose that the quarterback takes 0.30 s to return to the ground after throwing the ball. How far will he move horizontally, assuming his speed is constant?

###### FREE Expert Solution

a) The expression for the conservation of momentum:

$\overline{){{\mathbf{m}}}_{{\mathbf{0}}}{{\mathbf{v}}}_{{\mathbf{0}}}{\mathbf{=}}{{\mathbf{m}}}_{{\mathbf{f}}}{{\mathbf{v}}}_{{\mathbf{f}}}}$

solving for v0:

###### Problem Details

a) An 80 kg quarterback jumps straight up in the air right before throwing a 0.43 kg football horizontally at 15 m/s. How fast will he be moving backward just after releasing the ball?

b) Suppose that the quarterback takes 0.30 s to return to the ground after throwing the ball. How far will he move horizontally, assuming his speed is constant?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Intro to Conservation of Momentum concept. You can view video lessons to learn Intro to Conservation of Momentum. Or if you need more Intro to Conservation of Momentum practice, you can also practice Intro to Conservation of Momentum practice problems.