Question

4. An object travels 20 m in 2 s and then another 16 m in 2 s. What is the average speed of the object?

Answer 1

Answer:

The average speed is 9 m/s.

Given :

The objects travel = 20 m and 16 m

Both travel in = 2 s each.

Solution :

Object 1 travels in = 20 m in 2s

Object 2 travels in = 16 m in 2s

Average speed = ??

Average speed is the median of speeds which are different. It is used to make the different speeds appear like a single speed only.

★ Average speed = $\sf{\frac{Total\: Distance}{Total\:Time}}$

• Total Distance = 20 m + 16 m
• Total Time = 2s + 2s

⇒ 20 + 16/2 + 2

⇒ 36/4

⇒ 9 m/s or 9ms$\sf^{-1}$

Therefore, the average speed is 9 m/s.

Answer 2

Answer:

Average speed=Total distance/Total time taken

=20+16/2+2

=36/4

=9 m/s