Physics Help >> Index to Physics Homework Help »Conservation of Energy Quiz 1

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1

A bullet of mass kg is shot into a wooden block of mass kg.

They rise to a final height of m as shown. What was the initial speed (in m/s) of the bullet before it hit the block?

2
A 5.0 kg ball is attached to a vertical unstretched spring with k = N/m and then released. What distance does the ball fall just as it momentarily comes to rest?
3

A spring with constant k = N/m is at the base of a frictionless, º-inclined plane. A 0.5 kg block is pressed against the spring, compressing it m from its equilibrium position.

The block is then released. If the block is not attached to the spring, how far (in m) along the incline will it travel before it stops? (Give the distance along the incline - not the height above the ground.)

4

A ball rolls down a

starting at m/s. At the bottom of the slope its speed is m/s. What is the height (in m) of the slope?

5
A stone is thrown vertically downward from a cliff with a speed of m/s. It has J of kinetic energy just before it hits the ground. If the rock had been thrown horizontally instead of vertically, how much kinetic energy would it have just before it hits the ground?

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