Question

The first law of motion can be derived from the second law of motion if the mass isand the net external force is.

• A. constant
• B. zero
• C. varying
• D. non-zero

Answer 1

Answer: (A), (B)

zero

The equation of the second law of motion, F = $\frac{\Delta p}{\Delta t}$, becomes F = ma, when mass is constant. If the net external force is zero, the acceleration will be zero, which justifies the first law of motion.