The position of an object moving along x-axis is given by x = a + bt2 where a = 8.5 m, b = 2.5 ms–2 and t is measured in seconds. Then which of the following is true ?

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Velocity at t=2 sec is zero

average velocity between t = 2, t = 4 sec is 15 m/s.

velocity at t = 4 sec is 10 m/s

all the above are true

answer is B.

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