- #1

AlchemistK

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## Homework Statement

A staircase contains three steps each of 10 cm high and 20cm wide(refer attachment).What should be the minimum horizontal velocity if a ball rolling off the uppermost plane so as to hit directly the lowest plane?

## Homework Equations

s= u*t + 1/2 a*t^2

## The Attempt at a Solution

In the vertical motion,

s= u*t + 1/2 a*t^2

=> 0.3 = 0 + 1/2 * 10 * t^2

=>t= [itex]\sqrt{}6[/itex] /10 s

therefore, v=s/t => 2.45 m/s

Where did i go wrong? The given answer is 2 m/s and i don't believe that its an approximation.