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The height and width of each step of a s...

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))`

A

`1.5 sqrt(5) ms^(-1)`

B

`3sqrt(5) ms^(-1)`

C

`7.5 ms^(-1)`

D

`1.5 ms^(-1)`

Text Solution

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A
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