A toy projectile is fired from the ground vertically upward with an initial velocity of +29 meters per second. The projectile arrives at its maximum altitude in 3.0 seconds. As the projectile rises and then falls back to the ground, its acceleration
a:decreases, then increases
b:increases, then decreases
c:increase only d:remains the same
What is d: remains the same?
All objects fall at a constant acceleration of 9.81 m/s2 unless friction is present?