Question

10. Express the following speeds in km per hour: (a) 35 m per second ​

Answer 1

Answer:

126

Step-by-step explanation:

There ain't much you need to do.

There are certain conversion factors or contants that you either multiply or divide with while going from one system to other.

1m/s = 3.667km/h

Which makes it = 126 km/hr

It can be derived if you are interested which would be like

As 1000m = 1 km and m is in numerator so to cancel that divide you 35m/s with 1000m and finally multiply it with 3600 coz in 1 hour there are 3600s and seconds in your questions is in denominator so to cancel that multiply it.

Answer 2

To convert : $35 \mathrm{m} / \mathrm{sec} to km / hr.$

Solution :

• According to question we have to convert $35 \mathrm{~m} / \mathrm{sec } \ to\ km /hr.$

• As we know, $1 (kilometer/hour )=1000( meter ) / 3600( second )$
• which can also be expressed as  $1 (kilometer/hour) =\frac{5}{18} ( meter/second)$

         which is simplified form.

• Therefore, to convert we directly multiply given value of speed by the fraction $\frac{18}{5}.$

           $35 \mathrm{m} / \mathrm{sec}$  $= 35 \times \frac{18}{5} (km/hr)$

                          $= 7 \times 18 (km/ hr) \\= 126\ km/hr$

Hence, we get $126\ km/hr$ .