if a ball is dropped from a height of 19.6m, what is the velocity with which the ball hits the ground?

-19.6 m/s

Explanation:

Given:

y₀ = 19.6 m

y = 0 m

v₀ = 0 m/s

a = - 9.8 m/s²

Find: v

v² = v₀² + 2a (y - y₀)

v² = (0 m/s) ² + 2 (-9.8 m/s²) (0 m - 19.6 m)

v = ±19.6 m/s

Since the ball is falling downwards, v = - 19.6 m/s.

V=√2hg

Distance/time=√2gh

19. 6/t=√2*9. 8*19. 6

19. 6/t=19. 6

t=1sec