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(1) A boy weighing 350 N runs up a flight of 30 steps, each 20cm high in 1 minute. Calculate: (a) the work done and (b) the power spent

(2) A truck weighing 1000 kgf changes its speed from 36 km/hr to 72 km/hr in 2 minutes. Calculate: (a) the work done by the engine and (b) its power (g=10m/s²)

(3) How much energy is gained by a box of mass 20 kg when a man

(a) carrying the box waits for 5 minutes for a bus

(b) runs carrying the box with a speed of 3 metre per second to catch the bus?

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by samharsh

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