Calculate the speed of the car at each checkpoint by dividing the distance between each checkpoint in meters by the change in time. Record your answers in Table C of your Student Guide. The speed at the first quarter checkpoint is m/s. The speed at the second quarter checkpoint is m/s. The speed at the third quarter checkpoint is m/s. The speed at the finish line is m/s.

The speed at the first quarter checkpoint is 0.74 m/s. The speed at the second quarter checkpoint is 1.40 m/s. The speed at the third quarter checkpoint is 1.61 m/s. The speed at the finish line is 1.89 m/s.

Explanation:

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.