Question

How much time does it take a dropped object to fall 180 m on Earth?

18 s
36 S
10 s
6s

Answer 1

6s

Step-by-step explanation:

Assume it is dropped from rest and the gravitational acceleration is 10

By the equation of motion under constant acceleration:

`s=ut+(1)/(2) at^2`

180 = (0)t+10(t^2)/2

t = 6 or -6 (rejected)

t = 6 s