Chapter 6, Problem 17E

(a)

To determine

The tension in the light string that connects the blocks.

(b)

To determine

The total work done for a displacement in which the $12.0\text{ N}$ block descends $1.20\text{ m}$ on the $20.0\text{ N}$ block and $12.0\text{ N}$ block.

(c)

To determine

The total work done on the system of two blocks for the displacement in which the $12.0\text{ N}$ block descends $1.20\text{ m}$ and to compare it with the work done on $12.0\text{ N}$ block by gravity.

(d)

To determine

The speed of $12.0\text{ N}$ block when it descends $1.20\text{ m}$ while the system is released from rest.