Question

1. because acceleration is a quantity that has both magnitude and direction, it is a(n) _____________.
2. is the following sentence true or false? acceleration is the result of increases or decreases in speed. _____________
3. ignoring air resistance, a rock in free fall will have a velocity of _____________ after 4.0 seconds.

Explanation:

1. A quantity with magnitude and direction is a vector.
2. Acceleration is also due to changes in direction, not just speed changes, so false.
3. Using the formula $v = gt$ (where $g = 9.8\ m/s^{2}$), $v=9.8\times4.0 = 39.2\ m/s$.

Answer:

1. vector
2. false
3. 39.2 m/s