A child and sled with a combined mass of 55.20 kg slide, Ask an Expert

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Q. A child and sled with a combined mass of 55.20 kg slide down a frictionless hill that is 7.84 m high at an angle of 26o from horizontal. The acceleration of gravity is 9.80 m/s2. If the sled starts from rest, what is its speed at the bottom of hill?

Q. A 5.0g bullet with an initial velocity of 95.00 m/s lodges in a block of wood and comes to rest at a distance of 6 cm. Suppose the bullet undergoes a constant negative acceleration; it slows at a constant rate. How much time does it take for bullet to stop?

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