Question

Which of the following describes acceleration? A. Acceleration cannot be described with a negative number. B. Acceleration is a vector quantity. C. Acceleration describes how displacement changes with time. D. The SI units for acceleration are m/s.

Answer 1

Answer:

Acceleration is a vector quantity.

Explanation:

• Acceleration is defined as the rate of change of velocity per unit time.
• It is a vector quantity because it has both direction and magnitude.
• The acceleration of an object can be both negative and positive. If an object gains speed then it is positive otherwise it is negative.
• The units of accleartion are m/s^2.
• therefore, the only correct statement is that it is a vector quantity.

Answer 2

The answer would be:

B. Acceleration is a vector quantity.

We can rule out the others because:

---Acceleration CAN be described with a negative number. The sign actually shows the direction. A negative number indicates a deceleration.

---Displacement change over time is the definition of velocity NOT acceleration.

---The SI unit for acceleration is m/s².

***A vector quantity is measure of magnitude and direction, which acceleration has.