1.

A particle starts from rest at t=0 and moves in a straight line with an acceleration as shown below. The velocity of the particle at t=3 s is A. `2 m//s`B. `3m//s`C. `4 m//s`D. `6 m//s`

Answer» Correct Answer - B
The area of a-t graph gives change in velocity.
Area of a-t graph between `t=0` and `t=3 s` is
`(3xx2)+(-3xx1)=3`
`v_(t=3)-v_(t=0)=`area of a-t graph
`v_(t=3)-0=3impliesv_(t=3)=3 m//s`


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