How Does Momentum Relate to Gravity in Falling Objects?

[kevinli]

Homework Statement

A ball with a mass of 2kg is trown off a cliff 30m high and hits the ground with a momentum of 110 kg*m/s^2. What is the acceleration of gravity pulling on the ball?

Homework Equations

F=ma and I'm not sure what else.

The Attempt at a Solution

I probably messed up.
a=F/m
a=110N/2kg
a=55m/s^2

 

[Suy]

Momentum is not equal to force
p=mv, use this equation to solve it
where p(momentum) is N·s

 

[physicsface]

You don't need F=ma.

As Suy said, use p=mv. That'll give you velocity; then just use your basic kinematics equations to find a.