Boxes A and B in the figure have masses of 13.5 k g and 4.0 k g , respectively.

Question

Boxes A and B in the figure have masses of 13.5kg and 4.0kg , respectively. The two boxes are released from rest. What would be the speed of the boxes when box B has fallen a distance of 0.50 m? The coefficient of kinetic friction between box A and the surface it slides on is 0.20. Use conservation of energy.

Boxes A and B in the figure have masses of 13.5kg and 4.0kg , respectively. The two boxes are released from rest. What would be the speed of the boxes when box B has fallen a distance of 0.50 m? The coefficient of kinetic friction between box A and the surface it slides on is 0.20. Use conservation of energy.

Explanation / Answer

.2*13.5*9.81*.5 + 4*9.81*.5 = .5*(13.5+4)*v^2, then V = 1.938 m/s

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