Question

1. graph a represents the motion of a downhill skier. how fast was the skier moving after traveling down the hill for 2.5 seconds? ______________
2. in which graph does an object move at constant speed during the first 4 seconds? ______________
3. graph b represents the motion of a mountain biker. what is the bikers speed at times of 10 s and 20 s? ______________
4. determine the acceleration of the mountain biker during the 10 second to 20 second time - period. show your work.

______________

1. the plotted data points representing acceleration in a distance - time graph form a(n) ______________

instantaneous acceleration (page 348)

1. the measure of how fast a velocity is changing at a specific instant is known as ______________

132 physical science reading and study workbook • chapter 11

Explanation:

12.

Step1: Locate 2.5s on Graph A

On the x - axis of Graph A, find 2.5s.

Step2: Read corresponding speed

The corresponding speed value on the y - axis is 10 m/s.

In a distance - time graph, acceleration data points form a curve.

The measure of how fast velocity is changing at a specific instant is instantaneous acceleration.

Answer:

10 m/s

13.

Step1: Analyze speed - time relationship

In Graph A, speed is increasing. In Graph B, speed is constant at 5 m/s for the first 10 s.