# Homework Help: Help with simple conversion

1. Feb 8, 2006

### kfink85

I am in my first physics class and the professor just kinda skimmed over this but I am lost on how to convert km/h to m/s.

What's the explanation on how to convert 82.4 km/h to m/s?

Thanks in advance for any help.

2. Feb 8, 2006

### jamesrc

There are 1000 m in one kilometer.
There are 60 seconds in an hour.

If you want to change from km/h to m/s, you need to divide by 1000 and multiply by 60. Think of it as multiplying by 1: 1 km/h * (1000m/km) * (1h/60s)= (1000/60) m/s

3. Feb 8, 2006

### kfink85

Thanks very much.

4. Feb 9, 2006

### andrevdh

What I usually do is
$$\frac{1\ km}{1\ h}=\frac{1000\ m}{3600\ s}$$
which gives
$$1\ km/h=\frac{1}{3.6}\ m/s$$
or
$$1\ m/s=3.6\ km/h$$