question_answer

A rubber ball is bounced on the floor of a room which has its ceiling at a height of \[3.2\text{ }m\]from the floor. The ball hits the floor with a speed. of \[10\text{ }m/s\]and rebounds vertically up. If all collisions simply reverse the velocity of the ball, without changing its speed, then how long does it take the ball for a round trip, from the moment it bounces from the floor to the moment it returns back to it? Acceleration due to gravity is. \[10\text{ }m/{{s}^{2}}\].

A)  \[4\text{ }s\]             

B)  \[2\text{ }s\]

C)  \[0.8\,s\]            

D)  \[1.2\,\,s\]