Questions
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 inelastically, the time taken for the combined mass to reach the ground, in units of is :
detailed solution
Correct option is A
Time for collision t1=relative distancerelative velocity=h2gh [relative acceleration is zero]After t1 , velocity of A =VA=0−gt1=−gh2 and velocity of B=VB=2gh−gt1=gh2−12=gh2At the time of collision , apply momentum conservation P→i=P→f ⇒mV→A+mV→B=2mV→f ⇒-gh2 +gh2 =2V→f ⇒ Vf=0 and Height from ground at time of collision , h'=h−12gt12=h−h4=3h4 So time taken for the combined mass to reach the ground = 2h'g=2×3h4g=3h2g=32hgTalk to our academic expert!
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