Answer:
V = 40m/s
Explanation:
The ball was launched horizontally, its initial vertical velocity is 0 m/s.
We use the following equation to determine the time to fall 15m
S = ut + ½ at², u = 0
15 = ½ ×9.8× t²
15 = 4.9t²
t = √15/4.9
t = 1.7496secs
This is approximately 1.75secs. During this time, the ball moves a horizontal of 70m. We'll use the equation to determine the ball’s horizontal velocity.
S = V×t
70 = V×1.75
V = 70/1.75
= 40m/s.
