Answer:
The force needed is 400 Newtons.
Explanation:
The force can be determined by means of Newton's law.
[tex]F = m \cdot a[/tex] (1)
Where F is the force needed to stop the football player, m is the mass of the football player and a is the acceleration.
[tex]F = (80 kg)\cdot (5m/s^{2})[/tex]
[tex]F = 400 kg.m/s^{2}[/tex]
However, 1N = 1 kg.m/s^{2}
[tex]F = 400 N[/tex]
Hence, the force needed is 400 Newtons.
