PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Stone A is dropped from the top of a 60m high cliff. One second later, stone B is thrown vertically downward from the same point so that both stones reach the ground simultaneously. Neglect air resistance and take g=10m/s2.
(a) If stone A takes ts to reach the ground from the moment it is released, express the time of flight of stone B in terms of t.
(b) Calculate the initial speed with which stone B must be thrown downward so that both stones hit the ground together.
(c) Find the distance between the two stones 0.5s after B is released.