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Byju's Answer
Standard XII
Physics
Newton's Second Law
A body of mas...
Question
A body of mass
m
is lunched up an a rough indines plane making an angle
45
o
with horizontal. If time of ascent is
1
3
of time of descent, the frictional coefficient between plane and body is
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Solution
t
A
=
√
2
S
a
A
&
t
D
=
√
2
S
a
D
t
A
=
1
3
t
D
√
2
S
g
sin
θ
+
μ
cos
θ
=
1
3
√
2
S
g
sin
θ
−
μ
g
cos
θ
9
g
sin
θ
−
9
μ
g
cos
θ
=
g
sin
θ
+
μ
g
cos
θ
8
g
sin
θ
=
10
μ
g
cos
θ
8
10
sin
θ
cos
θ
=
μ
∴
μ
=
4
5
tan
θ
(
∵
tan
=
45
o
)
So,
μ
=
4
5
=
0.8
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