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JEE Main Physics Class 11 Motion in a Straight Line and Plane Part 1 Questions
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© examsnet.com
Question : 62
Total: 100
Two stones are thrown up simultaneously from the edge of a cliff 240 m high with initial speed of 10 m/s and 40 m/s respectively. Which of the following graph best represents the time variation of relative position of the second stone with respect to the first ?
(Assume stones do not rebound after hitting the ground and neglect air resistance, take g = 10 m/ s
2
)
[2015]
(The figures are schematic and not drawn to scale)
Validate
Solution:
y
1
=
10
t
−
5
t
2
;
y
2
=
40
t
−
5
t
2
for
y
1
=
−
240
m
,
t
=
8
s
∴
y
2
−
y
1
=
30
t
for
t
≤
8
s
for
t
>
8
s
y
2
−
y
1
=
240
−
40
t
−
1
2
g
t
2
© examsnet.com
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