Question

Which of the following is a vector quantity?

A. 20 mph
B. 30 mph northwest
C. 30 miles
D. 55 m/s

Answer 1

The vector quantity among the options provided is B. 30 mph northwest because it includes both magnitude (30 mph) and direction (northwest).

Step-by-step explanation:

The student asked, Which of the following is a vector quantity? To answer this, we need to understand that a vector quantity is one that includes both magnitude and direction. When we look at the options given:

• A. 20 mph: This represents speed, which is a scalar quantity because it lacks direction.
• B. 30 mph northwest: This is a vector quantity because it includes both magnitude (30 mph) and direction (northwest).
• C. 30 miles: This is a distance, a scalar quantity since no direction is specified.
• D. 55 m/s: This is speed, a scalar quantity, as no direction is given.

Thus, the correct answer is B. 30 mph northwest, as it is the only option that is a vector quantity.