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Subject :NSO    Class : Class 9

Read the passage carefully and answer Q.

A dancer demonstrating dance steps along a straight line. The position time graph is given below.

The average velocity of the dancer during time interval between t = 4.5 s to t = 9 s is

(A) 1 ms-1

(B) -1.33 ms-1

(C) 2.75 ms-1

(D) - 0.89 ms-1.

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