and 
are two identical masses at rest suspended by an inextensible string passing over a smooth frictionless pulley. Mass 
is given a downward push with a speed 
as shown in fig. 1.191. It collides elastically with the floor and rebounds immediately. What happens immediately after collision?
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a)
and 
both move upwards with equal speeds
b)
and 
both move upwards with different speeds
c)
moves upwards and 
moves downwards with equal speeds
d)
Both 
and 
are at rest
and are two identical masses at rest suspended by an inextensible string passing over a smooth frictionless pulley. Mass is given a downward push with a speed as shown in fig. 1.191. It collides elastically with the floor and rebounds immediately. What happens immediately after collision?a)
and both move upwards with equal speeds
b)
and both move upwards with different speeds
c)
moves upwards and moves downwards with equal speeds
d)
Both and are at rest
Question ID - 100518 | SaraNextGen Top Answer and are two identical masses at rest suspended by an inextensible string passing over a smooth frictionless pulley. Mass is given a downward push with a speed as shown in fig. 1.191. It collides elastically with the floor and rebounds immediately. What happens immediately after collision?
a)
and both move upwards with equal speeds
b)
and both move upwards with different speeds
c)
moves upwards and moves downwards with equal speeds
d)
Both and are at rest
and are two identical masses at rest suspended by an inextensible string passing over a smooth frictionless pulley. Mass is given a downward push with a speed as shown in fig. 1.191. It collides elastically with the floor and rebounds immediately. What happens immediately after collision?
|
a) |
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|
b) |
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c) |
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d) |
Both |
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(a) Since collision is elastic, |
will rebound with same velocity as it strikes with. And at the time of collision, velocities of 
and 
will be same in magnitude