Question

A ball is drooped from a top of a tower.in last second of its motion it travels a distance of 15m. find the height of the tower.

Answer 1

Hey there,
Using the eq.
S=1/2gt^2
s=(1/2gt^2-1/2g(t-1)^2)=>s=1/2(g(2t-1))=15=>2t-1=3=>t=2so height = 1/2gt^2=20m

        Hope it helps....