1)A 280-kg roller coaster car reaches the top of a 22-m hill with 59 kJ (kilojou

Question

1)A 280-kg roller coaster car reaches the top of a 22-m hill with 59 kJ (kilojoules) of kinetic energy. What is its speed at the bottom of the hill, assuming air resistance and friction are negligible?

Its speed is ------m/s

2) A system initially has 151 J of kinetic energy and 173 J of potential energy. A non-conservative force does +347 J of work on the system, after which its potential energy is -224J. Whta is the system final kenetic energy?

The final kinetic energy is -------- J

3)When a 7.5 g (note the units) bullet is fired from a 3.9 kg rifle, the rifle's recoil speed is 1.4 m/s. What is the speed of the bullet?

The speed is ---------- m/s

Explanation / Answer

1)29.3m/s

2)895j

3)728m/s

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