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The position of and object moving along ...

The position of and object moving along x-axis is given by `x=a +bt^(2)`, where `a=8.5 m` and b=2.5 ms^(-2) and (t) is measured in seconds. What is the velocity at `t=0`s and `t=2.0 s?` What is the average velocity between `t=2.0s` and `t=4.0 s`?

A

Velocity at t=2 sec is zero

B

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

C

velocity at t = 4 sec is 10 m/s

D

all the above are true

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The correct Answer is:
B
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AAKASH SERIES-MOTION IN A STRAIGHT LINE -EXERCISE -II
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