You are lifting up two heavy boxes, one resting on top of the other, while exert

Question

You are lifting up two heavy boxes, one resting on top of the other, while exerting a veryic upward force of 200 N. The top box has mass 10kg and the magnitude of the contact force the boxes exert on each other is 108N. What is the mass of the bottom box? You are lifting up two heavy boxes, one resting on top of the other, while exerting a veryic upward force of 200 N. The top box has mass 10kg and the magnitude of the contact force the boxes exert on each other is 108N. What is the mass of the bottom box?

Explanation / Answer

Force on block 1 = 108 (up) - 98 (down) = 10 N, thus acceleration = 10/10 m.s^2 = 1 m/s^2 up.

Force on system = 200 -(10+m)*9.8 = 102-9.8m
Acceleration of system = (102-9.8m)/(10+m) = 1,
Thus, 102-9.8m=10+m,
10.8m = 92 --> m =92/10.8 = 8.518 Kg

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