Physics
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A golf ball was released from rest from the roof of a 7.0 m tall building. After reaching the ground, it bounced off it and reached a maximum height of 4.0 m. Calculate what percentage of the initial energy is lost.
A block starts gliding down a frictionless incline from a height of 9.0 m above the foot of the incline. After reaching the bottom of the incline, it slides on a level horizontal surface on which the coefficient of kinetic friction is 0.45. Calculate the distance the block travels across the surface before coming to a stop.