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You pull a 5-kg sledge with a 15-kg child with a force exerted at the angle...

You pull a 5-kg sledge with a 15-kg child with a force exerted at the angle of 30° above the horizontal. The friction coefficient between the child and the sledge is 0.6 and between the sledge and the ground is 0.1. What is the magnitude of the force you exert if the sledge: (1) slides with constant velocity, (2) slides with such an acceleration that the child starts to slip off the sledge?

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