A person, standing on the roof of a `40m` high tower, throws a ball vertically upwards with speed `10 m//s`. Twp seconds later, he throws another ball again in vertical direction. (use `g = 10 m//s^(2)`) Both the balls hit the ground simultaneously.

Options

A. The first stone hits the ground after `4` seconds.
B. The second ball. Was projected vertically downwards with speed `5 m//s`.
C. The distance travelled by the first ball is `10 m` greater than the distance travelled by the second ball.
D. Both balls hit the ground with same velocities

Answer

A, C, D