1.A ball is dropped from the height of 20m.calculate

(i) the time taken by the ball to reach the ground.
(ii) the velocity with which the ball strikes the ground.

1 answer

hf=hi+vi*t-4.8t^2
0=20+0*t-4.8t^2

solve for t.

vf=vi+9.8t, using t from above, solve for vf