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Class 11 NEET Physics Work, Energy and Power Questions
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© examsnet.com
Question : 42
Total: 89
A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest
(2011)
at the highest position of the body
at the instant just before the body hits the earth
it remains constant all through
at the instant just after the body is projected
Validate
Solution:
Power,
P
=
→
F
⋅
→
v
=
F
V
c
o
s
θ
Just before the earth
θ
=
0
°
.Hence,the power exerted by the gravitational force is greatest at the instant just before the body hits the earth
© examsnet.com
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