rot ke

A solid sphere of mass m rolls down a incline plane of height h.Find KErot of sphere.

1 Answers

62
Lokesh Verma ·

i assume that u mean that there is no slipping..

In that case,
mgh=1/2mv2+1/2Iω2

I=2/5mr2
1/2Iω2=1/5mv2

KE rotational = 1/5 mv2
KE translational 1/2mv2

5/2 x KE rotational= (KE translational)

KE total = (5/2+1)KE rot = mgh

hence 2/7mgh

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