Question: An empty crate slides down a ramp, starting with a speed v 0 and reaching the bottom with a speed v and kinetic energy K

An empty crate slides down a ramp, starting with a speed v0 and reaching the bottom
with a speed v and kinetic energy K. Some books are placed in the box, so that the total
mass is quadrupled. The coefficient of kinetic friction is constant and air resistance is
negligible. Starting again with v0 at the top of the ramp, calculate the speed at the bottom.
Calculate the kinetic energy of the crate with books at the bottom.

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