You lift a 25-kg child 0.80 m, slowly carry him 10 m to the playroom, and finally set him back down 0.80 m onto the playroom floor.

Question

Physics

Corey Hines

30 September, 22:24

You lift a 25-kg child 0.80 m, slowly carry him 10 m to the playroom, and finally set him back down 0.80 m onto the playroom floor.

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Kian Jarvis · Answer 1

The work done one the child will only depend on the direction of the movement relative to the force applied. You lifted the child and carried him 10 m to the playroom. With respect to the horizontal direction, you applied no work since the direction of the force you applied is upward.