Question

A car attains a velocity of 10 m s${}^{-1}$ in 5 s. If initially, it had been at rest, its acceleration must be ___________ .

• A. 50m s${}^{-2}$
• B. 2 m s${}^{-2}$
• C. 5 m s${}^{-2}$
• D. 0.6 m s${}^{-2}$

Answer 1

The correct option is B 2 m s${}^{-2}$

Initial velocity of the car $u=0$

Final velocity $v=10m/s$

Time taken $t=5s$

Using $v=u+at$

$\therefore$ $10=0+a\times 5$

$⟹a=2m/s^2$