A car travels 10 m/s east. Another car travels 10 m/s north. The relative speed of the first car with respect to the second is:

a. more than 20 m/s.

b. equal 20 m/s

c. 0 m/s.

d. less than 20 m/s.

d. less than 20m/s

Explanation:

To the 2nd car, the first car is travelling 10m/s east and 10m/s south. So the total velocity of the first car with respect to the 2nd car is

[tex]/sqrt{10^2 + 10^2} = 10/sqrt{2}=14.14m/s

As 14.14m/s is less than 20m/s. d is the correct selection for this question.