speed and velocity

Question

a car is driving west on a highway at 25 m/s. what is the car's km/h and velocity?

Answer 1

This is a problem of converting units of m/s to units of km/h. This can be accomplished using dimensional analysis.

25 m/s x 60 s/min x 60 min/hr x 1 km/1000 m = 90 km/hr