When a person jumps up

  1. He exerts force on the ground
  2. The ground exerts force on him
  3. Both (1)and (2) are true
  4. Both (1) and (2) are false

Gravity does downward work on you. 

When you push yourself up you are unbending your knees such that your entire mass accelerates up, and however far up it accelerates before your feet leave the ground, the normal force from the ground is doing work upward on you.

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he exerts force on the ground

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please can u explain why

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