A mass m1 = 3.5 kg rests on a frictionless table and connected by a massless string over a massless pulley to another mass m2 = 4.8 kg which hangs freely from the string. When released, the hanging mass falls a distance d = 0.71 m.

1) How much work is done by gravity on the two block system?
34 J (All of my answers are correct up to the last question, which I need help on)

2) 2) How much work is done by the normal force on m1?
0 J

3) What is the final speed of the two blocks?
2.84 m/s

4) How much work is done by tension on m1?
14.1 J

5) What is the tension in the string as the block falls?
19.9 N

7) What is the NET work done on m2?
**** This is the question I need help on. I gave the answers to the previous questions because something in there might be needed for solving this part of the problem.

Question

A mass m1 = 3.5 kg rests on a frictionless table and connected by a massless string over a massless pulley to another mass m2 = 4.8 kg which hangs freely from the string. When released, the hanging mass falls a distance d = 0.71 m.

1) How much work is done by gravity on the two block system? 
34 J (All of my answers are correct up to the last question, which I need help on)

2) 2) How much work is done by the normal force on m1?
0 J

3) What is the final speed of the two blocks?
2.84 m/s

4) How much work is done by tension on m1?
14.1 J

5) What is the tension in the string as the block falls?
19.9 N

7) What is the NET work done on m2?
**** This is the question I need help on.  I gave the answers to the previous questions because something in there might be needed for solving this part of the problem.

anonymous · Answer

attachment

anonymous · Answer

Okay nm, got it.  Just a rounding error in the velocity calculation.

7. is (0.5)(4.8)(2.84^2) = 19.4 J