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Q.

Sarita lives on the 3rd floor of a building at the height of 15 m. She carries her school bag weighing 5.2 kg from the ground floor to her house. The amount of work done by her is__ (Take g = 10 m/s2)


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a

960 J

b

780 J

c

450 J

d

640 J 

answer is B.

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Detailed Solution

Sarita lives on the 3rd floor of a building at the height of 15 m. She carries her school bag weighing 5.2 kg from the ground floor to her house. The amount of work done by her is 780 J.
Mass, m=5.2 kg
g=10 m/s2
Height, h=15 m
Work done =mgh [Change in height so potential energy]
⇒ =5.2×10×15 ⇒  W=780 J
 
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