A car increases its speed from 10m/s to 30 m/s with an acceleration of 5m/s². What is the time taken by the car to do so?

Given: Car increases its speed from 10m/s to 30 m/s with an acceleration of 5m/s2  

To find: Time taken by the car to increase speed.

Solution:

Initial speed u = 10m/s

Final speed v = 30 m/s

Acceleration a = 5m/s2  

We know: v = u + at

So,

$30 = 10 + 5 \times t$

$30-10 = \times t$

$\frac{30-10}{5} =t$

We get t = 4 seconds