1. The best rebounders in basketball have a
vertical leap (that is, the vertical movement of a fixed point on their body)
of about 120 cm. (a) What is their initial launch speed off the ground? (b)
How long are they in the air?
2. A helicopter is ascending vertically
with a speed of 5.10 m/s. At a height of 105 m above the Earth, a package is dropped
from a window. How much time does it take for the package to reach the ground?
[Hint: v0 for the package equals the speed of the helicopter.]