A hollow sphere rolls down a `30^@` incline of length `6m` without slipping. The speed of centre of mass at the bottom of plane is

Options

A. 5g/7
B. 5g/14
C. 2g/3
D. g/3

Answer

B

Explanation

` a= (g sin theta ) /(1+(K^(2))/(r^(2))) = (g xx 1/2)/((1+2/5)) = g/2 xx 1/(7/5)= (5g)/14 `