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Homework Statement
A ball of mass 240 g is moving through the air at 20.0m/s with a gravitational potential energy of 70J. With what speed will the ball hit the ground?
Homework Equations
Eg = mgh
Ek = 1/2mv^2
W = mgd
The Attempt at a Solution
this is what i did:
at 0m, potential energy is 0 so kinetic energy must have 70J now.
Ek = 1/2mv^2
70 J = 1/2(0.24kg)v^2
v = 24.15 m/s
I don't know what to do with the 20 m/s that was given and yeah...please help!