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A staircase contains four steps each 10 ...

A staircase contains four steps each `10 cm` high and `20 cm` wide. The minimum horizontal velocity of a ball rolling off the uppermost plane so as to hit directly the lowest plane is

A

`42" ms"^(-1)`

B

`4.2" ms"^(-1)`

C

`24" ms"^(-1)`

D

`2.4" ms"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`-h =u sin theta t-(1)/(2) "gt"^(2)`
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