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Fittleroni
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Homework Statement
A 4.20 kg block is set into motion up an inclined plane with an initial speed of v0 = 7.70 m/s (Fig. P7.25). The block comes to rest after traveling 3.00 m along the plane, which is inclined at an angle of 30.0° to the horizontal.
1. For this motion, determine the change in the block's kinetic energy.
DeltaK = 1/2m(vf^2-vi^2)^2=-1/2mvi^2= -124.5J
This next question is the portion I am having problems with:
2. For this motion, determine the change in potential energy of the block-Earth system.
Homework Equations
DeltaU = mg(3.00)sin30.0
The Attempt at a Solution
=(4.20)(9.8)(3.00)(0.454)
=56.1
So what is wrong with my answer??