Velocity of swimmer across river = 1.30 m/s
Distance arrived downstream = 48 m
Width of river = 64 m
Time taken to cross river =
=
Speed of river current =
=
So, the river is flowing at a speed 0.975 m/s.
There could be more than just one answer, since kilograms can be converted to grams, to miligrams, etc.
or
Why?
Let's remember some conversion factors to work with kilograms (kg)
So, we are given the momentum:
We can rewrite the units of the momentum (equivalent) as follow:
and
Note: There could be more equivalent units for the momentum, in example, we could work with equivalent units for meters (distance) and seconds (time).
Have a nice day!