Question

A racing car completing 100 m straight in 2 seconds. What is the average speed of a car that travels for 3 hours and covers 40 km in the first hour, 45 km in the second hour, and 35 km in the third hour?

Answer 1

Answer:

40 kmph

Explanation:

Speed that is a scalar quantity depends on distance and not displacement. In the question they have given that the distance covered are 40 km then 45 km and then 35 km in an hour each.

Average speed = $\frac{DISTANCE total}{TIME total}$

40 + 45 + 35 = 120

120 kms divided by 3 = 40kmph.

To get this answer in SI Units convert km to m and hour to second.

$\frac{40(10^{3}) }{60(60)} = 11.11 \frac{m}{s}$