Question

A stone is dropped from a tower of height 19.6m.Find the final velocity just before touching the ground

Answer 1

Height of the tower from where the stone was dropped , h = 19.6 m

Initial velocity of the stone , u= 0m/s

Acceleration , g = 10 m/ s sq.

Final velocity ,v = ?

2gh = v sq. - u sq.

2 × 10 × 19.6 = v sq.

392 = v sq.

19 . 7 m/s = v