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JEEMAIN and NEET
>>
Physics
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Class11
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Work, Power and Energy
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Q)
A particle of mass m is projected with velocity u at an angle
α
with horizontal. During the period when particle decends from highest point to the position where its velocity vector makes
α
/
2
angle with horizontal, work done by gravity force is
(
a
)
1
2
m
u
2
tan
2
α
(
b
)
1
2
m
u
2
cos
2
α
tan
2
α
/
2
(
c
)
1
2
m
u
2
tan
2
α
/
2
(
d
)
1
2
m
u
2
cos
2
α
/
2
m
2
α
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