At the top of a cliff 100 m high, Raoul throws a rock upward with a velocity of 15.0 m/s. Assume g= 10 m/s^2

a. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?

b. Find the speed of the first and second rocks when they hit the ground.

For Ist rock . and ROCK it is thrown upward . (speed u ) . it is dropped. (speedu-0) U=O . h h TI = titt 2 Hi time to reach the same height T2 - to cover the height where it was through. h. from rest. 72 - to cover the height . Time difference between two rocks TI - T2