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Monic
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Homework Statement
An exceptional vertical jump from rest would raise a person 0.8m off the ground. To do this, what constant force would a 70kg person have to exert against the ground? Assume that the person lowers himself by 0.2m prior to jumping and remains in a standing position while in the air. The answer is 3400N.
Homework Equations
aΔt=v2-v1
d= 1/2(v1 + v2)∆t
d=v1Δt + 1/2aΔt^2
v2^2=v1^1 + 2ad
F=ma
μ=Ff/Fn
The Attempt at a Solution
I know acceleration must be found by finding the velocity of the person while in the air and while on the ground, just taking off. I do not know how to go about finding the two velocities . I would then put them in the fourth formula as it omits time