Question

A particle starts to move in a straight line from a point with velocity $10m{s}^{-1}$ and acceleration $-2.0m{s}^{-2}$. Find the velocity of the particle at $t=5s$.

• A. $10m{s}^{-1}$
• B. $5m{s}^{-1}$
• C. $0m{s}^{-1}$
• D. $-5m{s}^{-1}$

Answer 1

The correct option is C $0m{s}^{-1}$

Initial Velocity, $u=10m{s}^{-1}$

Acceleration, $a=-2m{s}^{-2}$

Time, $t=5s$

$\therefore v=u+at=10-(5\times 2)=0$