Two masses, m1 = 10 kg and m2 = 20 kg, are connected by a string that passes ove

Question

Two masses, m1 = 10 kg and m2 = 20 kg, are connected by a string that passes over a pulley as shown below. The system is released from rest. (a) If the surface of the table is frictionless, calculate the velocity of the blocks after they have moved 2 m. (b) Now, the surface has coefficients of static and kinetic friction of 0.9 and 0.6, respectively. Calculate the velocity of the blocks after they have moved 2 m.

Answers: A. 5.11 m/s B. 4.28 m/s

Please use only Energy methods to sove the problem.

I have part A, I just need help with part B.

Explanation / Answer

work done by Friction = 0.6*mg*2= 117.6J

dPE= 20*9.8*2=392J

dKE = 392-117.6 = 274.4J

V = 4.28m/s

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