Question

A bumblebee flies with a ground speed of 15.0 m/s . Calculate its speed in km/h.

Answer 1

Answer:

$54\frac{km}{h}$

Explanation:

This is a problem of conversion of units.

First of all you need to take the quantity the problem gives you and write it down with the units:

$15.0\frac{m}{s}$

Then you need to find the conversion factor for the units you need to convert:

In this case you need to convert from meters (m) to kilometers (km) and from seconds (s) to hours (h), so you have the following conversion factors:

- To convert from meters (m) to kilometers (km):

$15.0\frac{m}{s}*\frac{1km}{1000m}$

-To convert from seconds (s) to hours (h):

$15.0\frac{m}{s}*\frac{3600s}{1h}$

Then you should put the conversion factors in the same expression, so:

$15.0\frac{m}{s}*\frac{1km}{1000m}*\frac{3600s}{1h}$

Finally you multiply the numerators and the denominators and divide the results:

$15.0\frac{m}{s}*\frac{1km}{1000m}*\frac{3600s}{1h}=54\frac{km}{h}$

Answer 2

Speed in km/hr = 15 x 18
                            ------------
                                 5
             
                          =   54 km/hr.

Hope this helps!