A. Under which of the following conditions is the magnitude of the average veloc

Question

 A. Under which of the following conditions is the magnitude of the average velocity of a particle moving in one dimension smaller than the average speed over some time interval?  1.a particle moves in the +x direction without reversing 2.a particle moves in the ?x direction without reversing 3.a particle moves in the +x direction and then reverses the direction of its motion 4.There are no conditions for which this is true.  B. Members of the highway patrol are more interested in _____ as you drive.  1. your average speed 2. your instantaneous speed  C. If a car is traveling eastward and slowing down, what is the direction of the force on the car that causes it to slow down?  1.eastward 2.westward 3.neither eastward nor westward  D. In Figure below, match each vx vs. t graph on the top with the ax vs. t graph on the bottom that best describes the motion. Image: Diagram (a) shows the graph between velocity and time with a straight line. Diagram (b) shows a graph between velocity and time with a curved line. Diagram (c) shows a graph between velocity and time with a two line segments. Diagram (d) shows a graph between acceleration and time with a straight line. Diagram (e) shows a graph between acceleration and time with a horizontal line. Diagram (f) shows a graph between acceleration and time with three line segments.   1. a ? e; b ? d; c ? f 2. a ? f; b ? d; c ? e    E. What happens to the acceleration of a ball after it is thrown upward into the air?  1. increases 2. decreases 3. increases and then decreases 4. decreases and then increases 5. remains the same 

Explanation / Answer

A.

This is because when the particle reverses its direction and moves in -X direction , the displacement of the particle becomes smaller than the distance and this makes the average velocity smaller than the average speed.

B.

The speedometer measures the speed at a particular instant.

C.

Since the car moving in east direction is slowing down, the acceleration must be acting in opposite west direction. hence the force acts in west direction

during free fall motion , ball is under acceleration due to gravity in down direction which remain constant.

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