question_answer

The acceleration of a particle varies with time, as shown in figure, If the particle start moving from rest, the velocity of particle after 3s is:

A)  zero                

B)  \[2m/s\]

C)  \[3m/s\]                      

D)  \[4m/s\]

Correct Answer: C

Solution :

V = area under the curve \[=\frac{1}{2}\times 2\times 4-\frac{1}{2}\times 2\times 1=3m/s\]