Question

v) An object thrown vertically upwards reaches a height 20m. What was its initial velocity? How long will the object take to come back to the earth ? (g = 10 m/s2)​

Answer 1

Answer:

let initial velocity be u

u=0m/s¹

using s=ut+1/2at²

20=1/2(-10)(t²)

20= -5t²hence

t=2sec