A solid sphere of mass 1 kg, redius 10 cm rolls down an inclined plane of height 7m. The velocity of its centre as it reaches the ground level is

Options

A. 7 m/s
B. 10m/s
C. 15 m/s
D. 20 m/s

Answer

B

Explanation

Velocity at the loweset point,
`v=sqrt((2gh)/(1+(K^(2))/(R^(2))))`
`thereforev=sqrt((2xx10xx7)/(1+(2)/(5)))=10m//s`