Question

which of the following is a vector quantity?
a. 10 m/s down
b. 15 seconds of travel
c. 83 ounces of liquid
d. 55 km/hr in a truck

Explanation:

A vector quantity has both magnitude and direction. Option A has a magnitude (10 m/s) and a direction (down). Option B is a time - scalar. Option C is a mass - scalar. Option D has a magnitude (55 km/hr) but lacks a specific direction other than being in a truck which is not a proper directional description for a vector.

Answer:

A. 10 m/s down