• Support PF! Buy your school textbooks, materials and every day products Here!

Confusing (but surely simple) gravity problem

  • Thread starter vysis
  • Start date
28
0
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.

2. Homework Equations

F(net)=ma?


3. The Attempt at a Solution

Not a clue...
 

Answers and Replies

35
0
It's easy to say: "Not a clue..." :smile:

Maybe https://www.physicsforums.com/showthread.php?t=225490" 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.
 
Last edited by a moderator:
28
0
Lol, thank you soooo much (again!)
 

Related Threads for: Confusing (but surely simple) gravity problem

Replies
3
Views
1K
Replies
4
Views
1K
Replies
3
Views
877
Replies
10
Views
6K
  • Last Post
Replies
1
Views
2K
Replies
8
Views
2K
Replies
9
Views
790
Top