The height and width of each step of a staircase are 20 cm and 30 cm respectively. A ball rolls off the top of a stair with horizontal velocity v and hits the fifth step. The magnitude of v is (g = 10 ms^(-2))

The height and width of each step of a staircase are 20 cm and 30 cm r

1.	The height and width of each step of a staircase are 20 cm and 30 cm respectively. A ball rolls off the top of a stair with horizontal velocity v and hits the fifth step. The magnitude of v is (g = 10 ms^(-2))
Answer» `1.5 SQRT(5) MS^(-1)` `3sqrt(5) ms^(-1)` `7.5 ms^(-1)` `1.5 ms^(-1)` ANSWER :A