# Chapter 3 - Think and Explain - Page 55: 78

This is a writing exercise for the student, and answers will vary. Here is a sample. Zane starts from rest and accelerates smoothly along a straight track until he is moving at 12 m/s after 3 seconds. Over the same time interval and on the same track, Jayna starts out moving at 28 m/s, and accelerates smoothly to 40 m/s. Who had the greater acceleration? a. Zane b. Jayna c. Their accelerations are equal d. There is not enough information The correct choice is C. Acceleration is change in velocity over change in time, and they each added 12 m/s in 3 seconds, resulting in equal accelerations of $4 \frac{m}{s^{2}}$.

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