Question

A man runs $20\,km$ is $30\,\min .$ what is his speed?

Answer 1

Let us first have some idea about motion and motion in a straight line. When an object changes its location in relation to its surroundings throughout time, it is said to be in motion. Linear motion is defined as movement in a straight path. It's in a certain straight line, as the name implies, therefore it may be claimed that it just employs one dimension.

Formula Used:
$s = \dfrac{d}{t}$
S=speed
d=distance
t= time

Complete step-by-step solution:
Speed is defined as the ratio of distance travelled to the time it took to travel that distance. Because speed has only one direction and no magnitude, it is a scalar number.
Given:
Distance $= 20\,km$
Time$= \,30\,\min \, = \dfrac{1}{2}\,hr$
$speed = \dfrac{d}{t} = \dfrac{{20}}{{\dfrac{1}{2}}} = 40\,km/hr$

Additional Information: Velocity describes both how fast and in which direction an object is travelling, whereas speed merely represents how fast it is travelling. A car's speed has been stated if it is claimed to move at $60{\text{ }}km{h^{ - 1}}$. However, if the car is claimed to be travelling north at $60{\text{ }}km{h^{ - 1}}$, its speed has now been defined.
When considering movement in a circle, there is a significant difference. The average velocity of something moving along a circular path and returning to its starting point is zero, but the average speed is calculated by dividing the radius of the circle by the time it takes to complete the circle.
Note: Speedometers are used to measure the speed of vehicles. Odometers are used to track the distance travelled. A graph can be used to calculate speed as well. The distance-time graph aids in determining an object's speed.