Aball rolls off the edge of a horizontal roof at 10 m/s. 2 seconds later, the speed of the ball will be? a. 10 m/s b. 19.6m/s c. 29.6 m/s d.22 m/s

d). 22 m/s

Explanation:

Initial horizontal speed of the ball is in x direction

so we have

now it rolls off the edge and comes into the air. So after that it will start falling down due to gravity and still continue to move in horizontal direction with constant speed.

so after t = 2 s the speed in x direction will remains the same

speed in y direction is given as

so net speed of the ball is given as

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