in the following question if we write torque equation as a function of r

then

y(r)=mgr

or y=mx

which is a straight line

after the worm is at rest

y(R)=mgR

y=constant

This way the answer should come as A.

but torque is also=M.O.I*angular acceleration

At final point angular acceleration=0 ,therefore torque should be 0.

therefore on second thinking the answer should be B.
Can you please tell me where am I going wrong.

Vishesh Mangla , 9 Years ago

Grade Select Grade