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An axe is brought up to grindstone and brings the grindstone to a halt in 8...

An axe is brought up to grindstone and brings the grindstone to a halt in 8 seconds. How much work is done on the axe? What power was required to bring the grindstone to a halt?

radius of the grindstone=0.4
mass of grindstone=15kg
grindstone originally rotates at 30 rad/s
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