A particle is thrown in upward direction velocity is not given. Find out the displacement of the paticle in last sec in upward journey?
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Explanation:
Let u & H be initial velocity and maximum height respectively so, u=2gH
Now, for both time t1 & t2 displacement is h
h=ut−21gt2
t2+g2ut+g2h=0
which is having two roots t1and t2
t1+t2=g2uort1+t2=g22gH
⇒H=8g(t1+t2)2
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