(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

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

3. 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.

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# Homework Help: Kinematics problem, ball drop.

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