A 62 kg sprinter starts a race with an acceleration of 4.2 m/s2. What is the net external force on him? Express the numeral of your answer in SI units with 3 or more significant figures. 

To find the net external force acting on the sprinter, we can use Newton's second law of motion:

\[
F = m \cdot a
\]

Where:
- \( F \) is the net external force,
- \( m \) is the mass of the sprinter, and
- \( a \) is the acceleration.

Given:
- \( m = 62 \, \text{kg} \),
- \( a = 4.2 \, \text{m/s}^2 \).

Now we calculate the force:

\[
F = 62 \, \text{kg} \times 4.2 \, \text{m/s}^2 = 260.4 \, \text{N}
\]

The net external force on the sprinter is \( 260.4 \, \text{N} \).

Would you like more details or have any questions?

Here are 5 related questions to explore:
1. How would the net force change if the sprinter’s mass increased by 10%?
2. What is the sprinter's velocity after 2 seconds, assuming constant acceleration?
3. How much work is done by the net force over 5 meters?
4. What is the sprinter’s momentum at a speed of 8 m/s?
5. How would air resistance affect the net external force?

**Tip**: Always keep units consistent when solving physics problems to avoid errors.

A 62 kg sprinter starts a race with an acceleration of 4.2 m/s². What is the net external force on him? Express the numeral of your answer in SI units with 3 or more significant figures.

Find the net external force on a 62 kg sprinter who accelerates at 4.2 m/s². This problem demonstrates Newton's second law of motion (F = m × a), suitable for Grades 9-12 physics students. The calculated net force is 260.4 N, with step-by-step guidance provided.

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