My motorcycle travels #220# #km# in #2.25# hours. How would I correctly express its velocity in the appropriate SI units, #ms^-1#?

Question

1429 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-08-28T01:08:48

We need to convert km to m and hours to s.

#v=d/t=(220,000)/8100=27.2# #ms^-1#.

There are 1000 m in 1 km, so multiply by 1000: #220xx1000=220,000# #m#.

There are 60 minutes in 1 hr and 60 seconds in 1 min, so multiply by #60xx60=3600#: #2.25xx3600=8100# #s#.

Answer 2 · 2018-03-28T14:41:46

#24.44 \ "m/s"=24.44 \ "ms"^-1#.

Well, your velocity in #"km/h"# is:

#220 \ "km/2.25 h"#

#=88 \ "km/h"#

We know that #1 \ "m/s"=3.6 \ "km/h"#, and so your speed in #"m/s"# is:

#88/3.6=24.bar(4)#

#~~24.44 \ "m/s"#