Answer :
Final answer:
Using Newton's Second Law of Motion (F=ma), the net external force on Andrea, a 76.0 kg sprinter with an acceleration of 1.48 m/s², is calculated to be approximately 112 N.
Explanation:
The question 'Andrea, a 76.0 kg sprinter, starts a race with an acceleration of 1.48 m/s². What is the net external force (in N) on her?' is a classic example of applying Newton's Second Law of Motion, which is often explored in high school physics. This law can be expressed as F=ma, where F is the net external force, m is the mass of the object, and a is the acceleration. In Andrea's case, the mass (m) is 76.0 kg and the acceleration (a) is 1.48 m/s². Hence, the net force (F) exerted on her can be calculated by multiplying the two values.
To find the net external force on Andrea, the acceleration is multiplied by the mass: F = m * a = 76.0 kg * 1.48 m/s² = 112.48 N. Thus, the net external force on Andrea is approximately 112.48 newtons, which can be rounded to 112 N to match one of the provided answer choices.
