Using the momentum of the ball to find it's original height

[deadtreforest]

A 0.150 kg ball is dropped from rest. If the magnitude of the ball's momentum is 0.780 kg·m/s just before it lands on the ground, from what height was it dropped?

 

[hage567]

What have you tried? What equations do you think you might need? You must show some effort in order to get help.

 

[deadtreforest]

i used kg m/s / kg

.78/.15=5.2

m/s /g

5.2/9.8= .53

1/2 g (m/s /g)^2=m

1/2x9.8x.53^2=1.38

it said that i got it right