7. Calculate till 1
(Ans. 90
mass 5 kg at a height of 2 III I
(Ans. 20 W)
8. A box of mass 10 kg is lifted through a height
of 10 m in 49 s. Find the corresponding power.
9. Find the mass of water lifted by a pump of
(Ans. 186.5 kg)
power 0.5 hp to a height of 10 m in 49 s.
NEET SCIENCE A
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Answer:
A force of 7N as on an object. The displacement is, say 8 m, in the direction of the force. Let us take it that the force acts on the object through the displacement. Wtm is the work done in this case?
Ans. F=7N
s = 8 m
W = F × s
= 7 N × 8 m
W = 56J
∴ Work done is 56 J.
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