Final answer:
The net external force on a 63.0-kg sprinter accelerating at 4.20 m/s² is calculated using Newton's second law (F = ma), resulting in a force of 264.6 N, which is not listed in the provided options.
Step-by-step explanation:
The question pertains to determining the net external force on a sprinter who has a mass of 63.0 kg and starts with an acceleration of 4.20 m/s². To find the net external force, we can use Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).
By multiplying the sprinter's mass (63.0 kg) by the given acceleration (4.20 m/s²), we get the net external force:
F = ma
F = 63.0 kg × 4.20 m/s²
F = 264.6 N
Therefore, the correct answer is not listed among the provided options since 264.6 N is the calculated net force on the sprinter when starting the race with the specified acceleration.