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Byju's Answer
Standard XII
Physics
Acceleration
The displacem...
Question
The displacement is given by
x
=
2
t
2
+
t
+
5
in
m
, the acceleration at
t
=
5
s
will be
A
8
m/s
2
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B
12
m/s
2
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C
15
m/s
2
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D
4
m/s
2
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Solution
The correct option is
D
4
m/s
2
As we know that
a
=
d
2
x
d
t
2
Given,
x
=
2
t
2
+
t
+
5
⇒
d
x
d
t
=
4
t
+
1
⇒
d
2
x
d
t
2
=
4
⇒
a
=
(
d
2
x
d
t
2
)
t
=
5
s
=
4
m/s
2
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