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

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

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