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Question

A ball of mass 5 kg is dropped from a tower. Find the power of gravitational force at time t=2 seconds.
(Take g=10 m/s2)

A
1000 W
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B
2000 W
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C
100 W
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D
200 W
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Solution

The correct option is A 1000 W
Given, mass of ball m=5 kg
Gravitational force on the ball;

F=mg=5×10=50 N

Instantaneous power P =Fvcosθ

To find v: since a is constant
we use, v=u+atv=gt=10×2=20 m/s

P=(50)(20)cos 0
(as F and v are in same direction)
P=1000 W

Hence option A is the correct answer

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