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. (You must use energy methods for this problem.)

the answers are

a) 5.11m/s

b) 4.28m/s

Explanation / Answer

firsiloss in P.E= gain in K.E

20*2*10= 1/2*30*V^2

B)WORK DONE BY FRICTION +LOSS IN P.E= GAIN IN K.E

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