Evaluate the kinetic energy of a unit weight, in meters, flowing at 4 m/s?

3. A body requires a force of 100 N. to accelerate it at a rate of 0.20 m/s2. Determine the mass of the body in slugs. *

A grindstone in the shape of a solid disk with diameter 0.520 m and a mass of 50.0 kg is rotating at 850 rev/min. You press an axe against the rim with a normal force of 160 N (see Figure below), and the grindstone comes to rest in 7.50 s. What is the moment of inertia of the grindstone? What force is bringing the grindstone to a stop?  What is the net torque caused by that force? What is the size of the force? What is the coefficient of friction between the axe and the grindstone?

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