Question

A race car circles 10 times around a circle with a diameter of 7 km track in 50 min. Using SI
units, the average speed for the ten cycles is approximately given as:

Answer 1

Average Speed = 23.33 m/s

Explanation:

Given:

Diameter = 7 km

So, to find the distance, we need to multiply it by 10 as the race car circles 10 times round this 7 km track.

Distance = 7 × 10 = 70 Km or 70,000 m

Time        = 50 mins

                = 50 × 60 = 3000 s

Now, in order to find the average speed for 10 cycles, we use the formula:

$Speed = \frac {Distance} {Time}$

So by substituting the above values in the given formula, we get:

$Speed = \frac {70,000} {3000}$

Speed = 23.33 m/s