Question

A particle starts from rest at $t=0$ and moves in a straight line with an acceleration shown below. The velocity of the particle at $t=3 s$ is:

• A. $5 m / s ^{2}$
• B. $6 m / s ^{2}$
• C. $10 m / s ^{2}$
• D. $15 m / s ^{2}$

Answer 1

Answer: (A)

Velocity $=$ area under acceleration time graph
$\text { Velocity }=(5 \times 1)-(5 \times 1)+(5 \times 1) $
$\text { Velocity }=5-5+5=5 m / s ^{2}$