8. -/2 pointsBUElemPhys1 2.P.112 The diagram below records the position of two o

Question

8. -/2 pointsBUElemPhys1 2.P.112 The diagram below records the position of two objects, one red and one blue, at regular time intervals. For both the red object (the upper set of dots) and the blue object (the lower set), the motion is from left to right, with the left-most dot showing the object's position at t 0 s, and the right-most dot (the larger one) showing the object's position at t-20.0 s Comparing motion diagrams > x (m) 0 10 20 30 40 50 60 70 80 90 100 (a) For this situation, choose ALL of the correct statements. The motion diagram shows that the red object travels at constant velocity. The motion diagram shows that the red object speeds up. The motion diagram shows that the red object slows down. The motion diagram shows that the blue object travels at constant velocity. The motion diagram shows that the blue object speeds up. The motion diagram shows that the blue object slows down. One object passes the other near x 30 m one object passes the other near x = 50 m. One object passes the other near x70 m. The red object always has a higher speed than the blue object The blue object always has a higher speed than the red object. The red object has a higher average speed than does the blue object The blue object has a higher average speed than does the red object. (b) Calculate the average speed of the blue object. m/s

Explanation / Answer

a)Correct statements are:

The motion diagram shows that red object speeds up

The motion diagram shows that blue object travels with constant velocity.

The object passes the other near x = 50 m

The red object has higher speed than blue object

The red object has higher average speed than does the blue object.

b)V(avg) = (x2 - x1)/(t2 - t1)

V(avg) = (80 - 20)/(20 - 0) = 3 m/s

Hence, V(avg) = 3 m/s

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