An aeroplane drops a slack of rice as shown in the figure with a horizontal velocity of 100 km/s. If the altitude of its travel is 10,000 km, from the ground determine the time needed for the sack to strike the ground. 1) 47.50 s 

The origin of coordinates
is established at point K, where the initial velocity has (v_{K})_{x}=100
km/s and (v_{K})_{y}=0 as its components. Also between
points K and Q the accleration is g = 9.8m/s^{2}. So, the time taken t = 45.15 s 