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

A solid sphere of mass I kg, radius 10 cm rolls down an inclined plane

1.	A solid sphere of mass I kg, radius 10 cm rolls down an inclined plane of height 7 m. The velocity of its centre as it reaches the ground level is
Answer» 7 m/s 10 m/s 15 m/s 20 m/s Solution :`v = SQRT(1 + ((2gh)/(k^2))/(R^(2)))` For a solid SPHERE , `(k^2)/(R^2) = (2)/(5), v = sqrt((2 xx 10 xx 7)/((1 + (2)/(5)))) = 10 ` m/s