Question

A person on an apartment balcony holds a ball over the balcony and throws it directly upwards with an initial velocity of 30 m/s [up]. The ball was thrown from 15 m above the ground. How long will it take for the ball to hit the ground?

Answer 1

Solve this equation for t:

(height above ground) =

15 + 30t - (g/2) t^2 = 0

where g is the accleration of gravity