Question

The car at rest moves as 9 km/hr in 2hrs. Find the acceleration.

Answer 1

$$a=\dfrac{v-v_0}{t},$$ $$a=\dfrac{9\ \dfrac{km}{h}\cdot\dfrac{1000\ m}{1\ km}\cdot\dfrac{1\ h}{3600\ s}-0}{7200\ s}=3.5\cdot10^{-4}\ \dfrac{m}{s^2}.$$