Problem 2. Two masses are being lowered at constant speed as shown. (a) Which forces do positive work on M1? Explain. (b) Which forces do negative work on M1?Explain. (c)

Which forces do positive work on M2? Explain. (d) Which forces do negative work on M2? Explain. (e) Do any of your answers to a, b, c or d change if the mass is being lowered but is speeding up? Explain.