Question

A runner begins a race from rest and reaches a final speed of 22mph. It takes 3.45s. If the runner's mass is 76.4 kg and 1 mile = 1,609.34m. A) What is the runner's acceleration?​

B) What is the magnitude of the downward force acting on the runner?​

Answer 1

Acceleration:

a = (22 mph - 0 mph) / (3.45s) = 6.37 mph/s

Magnitude of the Downward Force:

F = m*a = 76.4 kg * 6.37 mph/s = 484.53 N