Two practical 
and 
initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of 
is 
and speed 
is 2
, the speed of centre of mass (CM) is
a)
Zero
b)
c)
d)
Two practical and initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of is and speed is 2 , the speed of centre of mass (CM) is
a)
Zero
b)
c)
d)
Question ID - 52759 | SaraNextGen Top Answer
Two practical and initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of is and speed is 2 , the speed of centre of mass (CM) is
a)
Zero
b)
c)
d)
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Two practical |
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a) |
Zero |
b) |
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c) |
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d) |
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1 Answer
127 votes
Answer Key / Explanation : (a) -
(a)
As initially both the particles were at rest therefore velocity of centre of mass was zero and there is no external force on the system so speed of centre of mass remains constant 
, it should be equal to zero.
127 votes
Answer Link
127