Question

a body covers first one third of Total distance with Speed 3 metre per second next one third of Total distance with Speed 6 metre per second last one third of Total distance with speed 9 metre per second the average speed of body is approximately equal to​

Answer 1

Answer:

Explanation: just remember the formula speed =distance /time for solving it.

Answer 2

$\text { Suppose each } 1 / 3 \text { rd distance is } x \text { metre. Therefore, total distance is } 3 x \text {. }$

$\text { The total time taken to cover this } 3 x \text { distance }=$

$x / 3+x / 6+x / 9=11 x / 18 \mathrm{sec}$

$\text { To cover a total distance of } 3 x_{1} \text { the time taken is } 11 x / 18 \text { sec. }$

$\text { So, the average speed is }$

$3 \mathrm{x} /(11 \mathrm{x} / 18)=54 / 11=4.9 \mathrm{~m} / \mathrm{s}$

The answer is 4.9m/s