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Motion in a Straight Line
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Section:
Physics
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© examsnet.com
Question : 100
Total: 115
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
.(The figures are schematic and not drawn to scale)
[Main 2015]
Validate
Solution:
y
1
=
10
t
−
1
2
g
t
2
y
2
=
40
t
−
1
2
g
t
2
y
2
−
y
1
=
30
t
(straight line)
but stone with 10 m/s speed will fall first and the other stone is still in air.
Therefore path will becomeparabolic till other stone reaches ground.
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