![](https://websites.umass.edu/ndarnton/files/2011/12/Mars-orbiter.jpg)
You’re probably calculating everything in MKS units (meters, kilograms and seconds) and I could probably guess what units you are using, but if you neglect to actually write down the units explicitly then
- You’re giving up a chance to catch algebra errors, and
- This could happen to you, causing international embarrassment.