Question

A ball is thrown vertically upwards. It goes to a height

of 20m and then returns to the ground. Taking g=10ms-2

find the initial velocity of the ball and total time of the

journey​

Answer 1

Answer:

4s

Explanation:

v

2 =u

2+2as

Given: s=20, v=0 (at highest point), a=-10

u= 2×10×20=20 m/s

s=ut+ 21 at 2

Given: s=0, u=20, a=-10

t=2×20/10=4 s