ICSE Class 10 Answered
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 | 13 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 | 14 Mar, 2012, 02:23: PM
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