how much energy is gained by a box of mass 20 kg when a man: (a)carrying a box waits for 5 minutes (b)runs carrying the box with a speed of 3m/s to catch the bus (c)raises the box by 0.5m in order to place it inside the bus? (g= 10m/s-2)

Asked by pri | 13th Mar, 2012, 06:37: PM

Expert Answer:

a) no energy gained.
b)no energy gained as the muscular energy is converted to the kinetic energy
c) increase in PE=20 g x 0.5  J

Answered by  | 14th Mar, 2012, 02:23: PM

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