Q1.23
On the way upward, the acceleration is g, 9.8 m/s2. At the highest point when it is stopped, the acceleration is still g, 9.8 m/s 2.
Q1.25
P1.26
P1.27
P1.29
C1.2
The primary reason that most cars can stop faster than they can accelerate forward is that their brakes can exert more force than their engines.