Question

A cargo was dropped down an helicopter, which hovered at an height of h=125m .When will the cargo reach the land? g=10ms-².Air resistance must be ignored.

Answer 1

The time of motion of the cargo

$$t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2\times 125\:\rm m}{10\:\rm m/s^2}}=5\:\rm s$$