Water Is Drawn from a Well in a Bucket Tied $\times$

Multiple Choice

Water is drawn from a well in a bucket tied to the end of a rope whose other end wraps around a cylinder of mass 50 kg and diameter 25 cm.As you turn this cylinder with a crank,the rope raises the bucket.If the mass of a bucket of water is 20 kg,what torque must you apply to the crank to raise the bucket of water at a constant speed?

A) 24 N · m
B) 2.5 N · m
C) 80 N · m
D) 2.4 $\times$ 10³ N · m
E) 49 N · m