A lady pulles a bucket filled with water having mass 10 kg from a well 8metre deep in 20 seconds. calculate work done and power .
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Answer:
Force applied by lady to overcome gravitational force =10*9.8=98N
s= 8
w= f*s= 98*8=784J
power = w/time
= 784/20=39.2. J/s or w
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work done=mgh=10×10×8=800j
power=energy/time=800/20=4watt
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