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Q.

A staircase contains three steps each 10  cm high and 20  cm wide. What should be the minimum horizontal velocity of the ball rolling off the uppermost plane so as to hit directly the lowest plane? in  ms−1

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Detailed Solution

If u is the minimum speed ,x=40,y=20,θ=00

y=tanθ−gx2sec2θ2u2

 Where g=10ms−2=1000cms−2

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−20=8000002u2; u=200 cms−1=2ms−1

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