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Byju's Answer
Standard XII
Physics
Momentum
If the collis...
Question
If the collision is elastic find verticle component of velocity of block at B. just after collision.
A
√
45
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B
√
15
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C
−
√
15
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D
20
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Solution
The correct option is
A
√
45
According to the question,
To along the plane velocity just before collision
v
=
√
2
g
(
3
)
=
√
60
m
/
s
To along the plane velocity just after collision
v
B
=
v
cos
30
∘
=
√
45
m
/
s
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