Question

A dog runs 12m is the frist 2s and 18m is the next 4s. What is its average speed ?

Answer 1

average speed = total distance/ total time

average speed = 12m + 18m / 25s+ 4s

average = 30/29

= 1.034m/s

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Answer 2

Answer:

Required average speed is 5 m/s.

Explanation:

Given,a dog runs 12m is the frist 2s and 18m is the next 4s.

Here we want to find average speed of the dog.

We know,

Average speed

$= \frac{d_1 + d_2}{t_1 + t_2}$

Where

$d_1 =$First cover distance

$d_2 =$Second cover distance

$t_1 =$time in first case

$t_2 =$time in second case

Here

$d_1 = 12 \: m \\ d_2 = 18 \: m \\ t_1 = 2 \: s \\ t_2 = 4 \: s$

So required average speed

$= \frac{12 + 18}{2 + 4} \\ = \frac{30}{6} \\ = 5 \: m. {s}^{ - 1}$

This is a problem of Speed and Distance chapter,

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