Question

What is the average speed of a car that travels 20m in 4s

Answer 1

Answer:

Acceleration is the change of velocity per unit time. Here, the initial velocity of the car is 0 m/s since it starts from rest. The final velocity is 20 m/s. So the change in velocity is,

20 m/s - 0 m/s = 20 m/s

So,

In 4 seconds, the velocity changes by 20 m/s

So, in 1 second, the velocity changes by 204m/s2=5m/s2