Question

What is the average speed of
a car that travels 400m in 20s,

Answer 1

answer: 20m/s

Step-by-step explanation:

400m in 20s by using the formula: average speed = distance traveled / elapsed time = 400m/20s = 20m/s. However, this is an average speed so the car could have been moving faster or slower at different points during those 20 seconds.

Answer 2

The average speed is 20 m/s or 72 km/h

Given : The car travels 400m in 20s

To find : The average speed of the car.

Solution :

We can simply solve this mathematical problem by using the following mathematical process. (our goal is to calculate the average speed)

Now, we know that :

Average speed = Total distance / Total time

In this case,

• Total distance = 400m
• Total time = 20s

So,

The average speed will be :

= 400 ÷ 20

= 20 m/s

So,

The car travels in 1 second = 20 m

The car travels in 3600 seconds = 20×3600 = 72000 m

Or,

The car travels in 1 hour = 72 km

(As, 3600 seconds = 1 hour , 1000 m = 1 km)

The average speed of the car = 72 km/h

Hence, the average speed of the car is 20 m/s or 72 km/h