Science Retake

A baseball pitcher throws a fastball at 42 m/s. If the batter is 18 m from the pitcher, approximately how much time does it take for the ball to reach the batter? 1/1 1.9 s 2.3 s 0.86 s 0.43 s

.43 s

A student drops a ruler to test her reaction time, and catches it at the 19 cm mark. According to the graph below, her reaction time is closest to 1/1

0.2 seconds

The graphs below represent the distance and time measurements of motion. A person was walking along a straight path. A distance of 400 m was covered in 2 minutes. Which of these graphs represents a person walking at a constant speed for the entire trip? 1/1 Option 1 Option 2 Option 3 Option 4

2

Juanti's response time is 0.8 second. How far does the car Juanti drives travel in her response time if the car is moving at 25 meters per second? 0/1 10 meters 20 meters 25 meters 31 meters

20

0/1 Option 1 Option 2 Option 3 Option 4

4

The graph below represents distance and time measurements for a moving object. What is the average speed of this object between 4.0 seconds and 7.0 seconds? 0/1 Captionless Image 5.0 m/s 5.4 m/s 5.7 m/s 6.7 m/s

6.7 m/s

The pattern shown below was left by an automobile as it dripped oil at a constant rate on the road while being driven. During which section of the trip was the car traveling with constant speed? 1/1 Captionless Image AB BC CD DE

bc

The graph below represents the relationship between distance and time for an object in straight-line motion. During which interval was the object at rest? 1/1 Captionless Image AB only BC only CD only both AB and CD

both

If there is no net force acting on an object, the object will 1/1 slow down and stop. change its direction of motion. accelerate. continue with constant speed in a straight line.

continue with a constant speed in a straight line

A rocket in space can travel without engine power at constant speed in the same direction. This condition is best explained by the concept of 0/1 gravity inertia acceleration frame of reference

inertia