(solution) Part A: A mass of 1.0 kg is being lowered (directly downward) by

(solution) Part A: A mass of 1.0 kg is being lowered (directly downward) by

Part A: A mass of 1.0 kg is being lowered (directly downward) by a string at the rate of 1.0 m/s2 such that the string is speeding up. Calculate the tension in the string.
A. 8.8 N

B. 10.8 N

C. 9.8 N

D. 7.8 N

E. 11.8 N

 Part B:

If the mass were lowered 1.7 m, calculate the work done by the tension in the string.
A. 15 J

B. 18 J

C. -18 J

D. 19 J N

E. -15 J

Part C: 

Calculate the change in the mass? kinetic energy after the displacement of 1.7 m, assuming it started at rest.
A. 0.9 J

B. 1.7 J

C. 3.0 J

D. 6.0 J

E. 0 J