# A man stands on a crane and throws a water balloon down at at 21 m/s. He finds that it takes 2.4s for the balloon to hit the ground. How fast is the water balloon travelling when it hits the ground?

Water balloon will hit the ground at color(purple)(44.52 m/s^2
$u = 21 \frac{m}{s} , t = 2.4 \sec , g = 9.8 \frac{m}{s} ^ 2$
color(red)(v = u + a t = u + g t
$v = 21 + 9.8 \cdot 2.4 = 21 + 23.52 = 44.52 \frac{m}{s}$