Question

a body is dropped from a height of 490 m from the ground.It will hit the ground after what time?​

Answer 1

Answer:

after    t = 10 s

Explanation:

h = 490 m

vi = 0 m/s

a = g

t = ?

using 2nd equation of motion

h = vi t + 1/2 gt²

490 = 0 + 1/2x 9.8 t²

t² = 490/4.9

t² = 100

t = 10 s