Question

A ball is thrown vertically dawnword with velocity of 20 m/s from the top of tower it hits the ground after some time with velocity of 8m/s the hieght of the tower is??​

Answer 1

16.8m

Explanation:

a= (-g)

v=8m/s

u=20m/s

v²=u²+2as

in this case since a=(-g)

v²=u²-2gs

8²=20²-2×10×s

64=400-20s

20s=400-64

20s=336

s=336/20

s=16.8m