Question

Which of the following is a velocity?

a. 50 mi/hr
b. 20 m/s
c. 34 miles south
d. 50 m/s north

Answer 1

d. `50 m//s` north

Explanation:

velocity is a vector.

a vector is a quantity with both magnitude (size) and direction.

a scalar is a quantity that only has magnitude.

speed shows magnitude in `m//s, mi//hr`, etc.

out of the above, `50 mi//hr` and `20 m//s` are speeds, and therefore scalars, since they do not have direction.

velocity is shown through speed, but also with a direction attached to it.

`50 m//s` north is the only velocity.

`34 mi` south is a length with a direction, whereas velocity is a speed with a direction.