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Force, Mass, Acceleration

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1. A horizontal force of 7.2 N acting on a 1.0 kg object initially at rest moves it through a parallel distance of 2.5 m. How much work is done on the object?

2. A student with a mass of 71 kg climbs a flight of stairs 5.0 m high in 10s. Calculate the power expended by the student.

3. A box of mass 5.0 kg is pulled vertically upwards by a force of 68 N applied to a rope attached to the box. Find a) the acceleration of the box, and b) the vertical velocity of the box after 2 seconds.

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