Newton’s Second Law of Motion: Concept of a System| Dynamics: Force and Newton’s Laws of Motion| College Physics| Openstax| Problem 1

A 63.0-kg sprinter starts a race with an acceleration of 4.20\:m/s^2. What is the net external force on him?

Solution:

The net force has a formula 

F=ma

Substituting the given values, we have

F=\left(63.0\:kg\right)\left(4.20\:m/s^2\right)

F=265\:N

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