Question

A ball is projected vertically upwards from the ground . If ball is at heigth h at t=4s to t=5s , then find the value of h

Answer 1

100 m

If ball is at a given height at two different times t = t1 and t = t2 then from equation

h= ut -1/2gt2

1/2gt2-ut-h=0

(t1+t2) =2u/g   ..................eq 1

t1t2=2h/g       .................eq 2

from      eq  2 h =100 m

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