Question

A ball is thrown vertically upwards from the top of a tower with velocity 20 m/s . The height of the tower is 25 m. Find the time taken by the ball to reach the ground

Answer 1

Hope it helps ✌️

Ans. is in the attachment..

Answer 2

total time of flight, t  is obtained  by solving this quadratic equation

h= -ut+ 1/2gt²  

25= -20t+1/2×10×t²

t²-4t-5=0

t=5s