Spring potential energy:
Gravitational potential energy:
Conservation of energy:
U0 + KE0 + Wnc= Uf + KEf + wf
Wnc is the work done by non conservative forces.
f = μkmg
A freight company uses a compressed spring to shoot 1.70 kg packages up a 1.00 m-high frictionless ramp into a truck. The spring constant is 341 N/m and the spring is compressed 33.0cm.
A careless worker spills his soda on the ramp. This creates a 50.0 cm-long sticky spot with a coefficient of kinetic friction 0.300. Will the next package make it into the truck?
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