Question

A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. what is the average speed?

Answer 1

Total distance covered = 100+80+45
= 225m
Total time taken = 40+40+20
=100sec
Average speed = total distance
covered/total time taken
=225/100
=2.25m/s

Answer 2

Answer:

The average speed of the person is $2.25$ $m/sec$.

Explanation:

• Average speed can be calculated by calculating the total distance traveled and the total time.
• The speed can be termed scalar quantity.

The average speed is given by the formula:

$Average$ $Speed=\frac{D}{T}$

where $D$ is the total distance traveled

           $T$ is the total time taken.

Step 1:

In the given question:

Total distance traveled, $D=(100 + 80 +45)$ $m$

                                            $= 225$ $m$

Total time, $T=(40+40+20)$ $sec$

                     $=100$ $sec$

Step 2:

The average speed $=\frac{225 m}{100 sec}$

                                 $=2.25$ $m/sec$

So, the average speed of the person is $2.25$ $m/sec$.