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EAMCET Engineering 2003 Solved Paper
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© examsnet.com
Question : 35
Total: 160
Consider the following statements
A
and
B
identify the correct answer given below :
(A) A body initially at rest is acted upon by a constant force. The rate of change of its kinetic energy varies linearly with time
(B) When a body is at rest, it must be in equilibrium.
A
and
B
are correct
A
and
B
are wrong
A
is correct and
B
is wrong
A
is wrong and
B
is correct
Validate
Solution:
KE
=
1
2
m
v
2
=
1
2
m
(
a
t
)
2
=
1
2
m
a
2
t
2
Rate of change of KE,
d
K
d
t
=
d
d
t
(
1
2
m
a
2
t
2
)
=
m
a
2
t
∴
d
K
d
t
∝
t
So, statement
A
is correct.
When the body is at rest, then it may be or may not be in equilibrium, so statement
B
is wrong.
© examsnet.com
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