A car increases its velocity uniformly from 20m/s to 40m/s in 2 minutes. Can you solve for its average velocity?

Explanation:

If velocity is increasing uniformly with time, this means the acceleration is constant. So we can use this formula,

Initial Velocity+Final Velocity/2.

Our total Velocity is 60 m/s. Let convert minutes to seconds, which is 120 seconds so we get

60m/s/120 s which we get 0.5 m/s.

Average velocity is 0.5 m/s^2.

The speed at the beginning is 20 m/s.

The speed at the end is 40 m/s.

The average speed is 1/2(20 m/s + 40 m/s)

That's  30 m/s .

The length of time for the change doesn't matter, as long as the change is uniform.

conservation of mass

mass before something happens = mass afterwards