DC -- time, velocity, and speed

The first concept discussed in the reading is ___.

• speed

• time

• velocity

• coordinate systems

What animals are shown racing in a picture in the reading assignment?

• snails

• cheetahs

• elephants

• birds

Displacement divided by the time of travel

• elapsed time

• origin

• velocity

• distance

Police give tickets based on __________.

• average velocity

• instantaneous velocity

Velocity and Speed are different because ---

• velocity is a scalar

• speed involves a time interval

• velocity is measured in m/s

• speed has no direction

What is the average velocity for this trip?

• not enough information

• 3 m/s

• zero

• 3 km/hr

This graph represents the motion of a person going from home, to the store, and back again. Why is the velocity negative at 2.5 hrs?

• The return trip is in the opposite direction.

• The person is moving back in time.

• It assumes constant speed.

• The reference frame is different for the return trip.