Boxes A and B in Figure P10.69 have masses of (12.0 mathrm{~kg}) and (4.0 mathrm{~kg}), respectively. The

Question:

Boxes A and B in Figure P10.69 have masses of $12.0 \mathrm{~kg}$ and $4.0 \mathrm{~kg}$, respectively. The two boxes are released from rest. Use conservation of energy to find the boxes' speed when box $\mathrm{B}$ has fallen a distance of $0.50 \mathrm{~m}$. Assume a frictionless upper surface. image text in transcribed