8th Ch 1 Lesson 2 Speed & Velocity

What is the SI unit for speed?

• m
• s
• m/s
• s/m

What are the axes on a distance-time graph?

• the x-axis is time and the y-axis is distance
• the x-axis is distance and the y-axis is time
• the x-axis is time and the y-axis is speed
• the x-axis is speed and the y-axis is time

If a train goes at a constant speed of 40 miles per hour for one hour, then at a constant speed of 50 miles per hour for two hours, what is its instantaneous speed at the beginning of the last hour of its trip?

• 40 mph
• 45 mph
• 47 mph
• 50 mph

What does a straight, sloped line on a distance-time graph represent?

• instantaneous speed
• constant speed
• changing speed
• zero speed

Which best describes the velocity of a person on a merry-go-round?

• zero
• constant
• increasing
• continuously changing