A 6.9 kg block is placed on a spring with a spring constant of 23 N/m, compressing it 3 m. What is the maximum height the block will reach when launched by the spring?

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Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

The energy produced as a result of this flow of electrons from atom to atom is called