A particle of mass m is dropped from a height h above the ground. At the same time another particle of the same mass is thrown vertically upwards from the ground with a speed of 
. If they collide head-on completely in elastically, the time taken for the combined mass to reach the ground, in units of 
is
Text Solution
Verified by ExpertsThe correct answer is:
A
JEE Main 2020
time for collision 
After 
and 
at the time of collision
and height from ground 
so time 
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