Question

A common English set of units for expressing velocity is miles/hour. The si unit for velocity is

a) km/s
b) cm/s m/hr
d) km/hr
e) m/s

Answer 1

The SI unit for velocity is meters per second (m/s). So the answer is:

e) m/s

Here's why the other options are not correct:

• km/s: This is also an SI unit, but it is larger than m/s (1 km = 1000 m).
• cm/s: This is also an SI unit, but it is smaller than m/s (1 m = 100 cm).
• m/hr: This is not an SI unit. Hours are not an SI unit for time (seconds are).
• km/hr: This is not an SI unit. This is a common unit used in English, but it is not part of the International System of Units.

Therefore, the only SI unit for velocity is m/s.