Final answer:
The coordinates for the point on the graph at 30 seconds are (30, 50), representing 30 seconds on the x-axis and 50 miles per hour on the y-axis, assuming constant acceleration.
Step-by-step explanation:
If a race car accelerates from 0 to 100 miles per hour in 60 seconds, and we assume the acceleration is constant, then we can find the speed of the car at 30 seconds by simply calculating half of the final speed, which would be 50 miles per hour. On a graph where the x-axis represents time in seconds and the y-axis represents velocity in miles per hour, the point at 30 seconds would be (30, 50).