Question

A 1,340kg car moving at 20km/h is accelerated at a constant rate of 7m/s2 up to a speed of 88km/h. What is the total time required?

Answer 1

The time it took to accelerate is

$$t=\frac{\Delta v}{\Delta a}=\frac{(88-20)·1000/3600}{7}=2.7\text{ s}.$$