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Q.

A disc and a sphere of same radius but different masses are rolling down  two inclined planes of the same altitude and length.Which one of the two objects gets to the bottom of the plane first?

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a

Disc

b

Sphere

c

Both reach at the same time

d

Depends on their masses

answer is B.

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Detailed Solution

Time to roll down the plane is given by T=2Laa = g sin θ1+K2R2For disc K2R2 = 12 = 0.5For sphere K2R2 = 25 = 0.4a(sphere) > a (disc)sphere reaches first
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