A ball is dropped from the roof of a tall building and simultaneously another ball is thrown horizontally with some velocity from the same roof. Which ball lands first? Explain your answer.

A ball is dropped from the building and simultaneously another ball is projected upward with some velocity. Describe the change in relative velocities of the balls as a function of time.

A ball is dropped from a building of height 45 m. Simultaneously another ball is thrown up with a speed 40 m/s. The relative speed of the balls varies with time as

A ball A is dropped from the top of a building and at the same time an identical ball B is thrown vertically upward from the ground. When the balls collide the speed of A is twice that of B. At what fraction of the height of the building did the collison occur?

A ball is throuwn with a speed of 20 m//s from top of a buling 150 m high and simultaneously another ball is thrown vertically upward witn a speed of 30 m/s from the foot of the builing . Find the time when both the balls will meet (g =10 m//s^2)