The System in the Figure Consists of a Steel Ball

Multiple Choice

The system in the figure consists of a steel ball attached by a cord to a large block of wood.If the system is dropped in a vacuum,the force in the cord is

A) zero.
B) equal to the difference of the masses of B and W.
C) equal to the difference of the weights of B and W.
D) equal to the weight of B.
E) equal to the sum of the weights of B and W.