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A particle is projected upwards with some velocity. At what height from ground should another particle be just dropped at the same time so that both reach the ground simultaneously? Assume that first particle reaches to a maximum height H

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a
6H
b
8H
c
4H
d
10H

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detailed solution

Correct option is C

For the first particle,time of flight    t1=22Hgforsecondparticle,time of flight    t2=2hggiven t1=t222Hg=2hgsquaring on both sidesh=4H


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