Answer:
[tex]Force=1085.56N[/tex]
Explanation:
Given data
Mass m=80 kg
Distance s=2.9 m
Time t=2.0 s
To find
Average Force
Solution
First we need to find the velocity
So
[tex]V^{2}=2as\\V^{2}=2(9.8m/s^{2} ) (2.9m)\\V^{2}=56.84\\V=\sqrt{56.84}\\ V=7.539m/s[/tex]
At 2.0 seconds the force must first overcome gravity
So
Force due to gravity=mass×gravity
=(80kg)×(9.8m/s²)
=784N
To Slow him F×t=mV
[tex]F*t=mV\\F=(mV)/t\\F=(80kg*7.539m/s)/2.0s\\F=301.56N[/tex]
The Net Force is given as:
[tex]Force=301.56N+784N\\ Force=1085.56N[/tex]
