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BITSAT 2019 Slot 2 Solved Paper
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© examsnet.com
Question : 9
Total: 150
A body is moving unidirectionally under the influence of a sources of constant power. The square of its displacement in time
t
is proportional to
t
3
t
2
t
√
t
Validate
Solution:
By work-energy theorem,
W
=
P
×
t
=
1
2
m
v
2
⇒
v
2
=
2
P
t
m
v
=
(
2
P
t
m
)
1
∕
2
or
d
s
d
t
=
(
2
P
t
m
)
1
∕
2
∫
d
s
=
∫
(
2
P
t
m
)
1
∕
2
d
t
s
=
(
2
P
m
)
1
∕
2
.
2
3
t
3
∕
2
i.e.
s
∝
t
3
∕
2
s
2
∝
t
3
© examsnet.com
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