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Q.

The position of an object moving along straight line ( x -axis) is given as  x = 9 + 3t2 , where x in metre and t in second. What is the average velocity during first two seconds of motion 

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a

12 metre per second

b

6 metre per second

c

4 metre per second

d

15 metre per second

answer is B.

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Detailed Solution

x=9+3t2
Vav=ΔxΔt=x2−xot2−to=9+3(2)2−9+3(0)22−0=6m/s

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