A car travels 40 miles north in the first 40 minutes of a trip. The same car travels 30 miles west in the next 30 minutes of the trip. What can be said about the motion of the car?

The car is moving at a constant velocity.

The car is accelerating at a constant rate,

The car is decreasing its speed,

The car is traveling at a constant speed.

D

Explanation:

A: Velocity has direction. Once the car changes direction, the velocity is no longer a constant.

B: The direction makes B untrue

C: r = 40 miles / 2/3 hour = 60 miles/hour

   r2 = 30 miles / 1/2 hour = 60 miles / hour

The car is not decreasing its speed. C is false.

D:  Speed does not have a direction. D is true.

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