Confusing (but surely simple) gravity problem

  • #1

Homework Statement

An exceptional vertical jump from rest would raise a person 0.80m off the ground. To do this, what constant force would a 70kg person have to exert against the ground? Assume the person lowers himself 0.20m prior to jumping and remains in a standing position while in the air.

Homework Equations


The Attempt at a Solution

Not a clue...

Answers and Replies

  • #2
It's easy to say: "Not a clue..." :smile:

Maybe" will help (as it already did). It's almost the same.

You need the velocity at which man must leave the ground to reach the height of 0.8 m (you know the g). Therefore you can calculate the acceleration and the force.
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  • #3
Lol, thank you soooo much (again!)

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