Question

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

Answer 1

Answer: 6.75 m/s

Explanation:

Given that in the first 40s he swims 100m and in the next 40s he swims 80m and in the last 20s he swims 45m can be expressed as

100/40,

80/40,

45/20.

When we add all of this we get

100/40+80/40+45/20

Taking the LCM as 40

We get

(100+80+90)/40=270/40

Which is equal to 6.75m/s

Hence we solved it!

Answer 2

Answer:

Explanation:

As it is asked average speed so we will use the formula for average speed:

therefore,

Average speed=total distance/ total time taken

therefore,

Average speed=100+80+45/ 40+40+20

Average speed=225/100 (Using decimals)

Average speed= 2.25

therefore,

Average speed of the person=2.25 m/s^2