Answer:
A. Velocity is negative (-)
Acceleration is positive,(+)
B. Velocity is positive. (+)
Acceleration is negative (-)
C. Velocity is zero (0).
Acceleration is negative (-)
Explanation:
The elevator is said to be moving downward, therefore, its motion is in the negative direction as the positive direction is upward in the y-axis. Velocity is negative (-)
As the elevator is making an emergency stop, it is decelerating. Deceleration is negative acceleration. However, since it occurs in the opposite direction, i.e. acceleration vector is pointing upward, acceleration is positive,(+)
The motion of the ball is in the upward direction, therefore the velocity is positive. (+)
The acceleration due to the force of gravity acts in the opposite direction to that of the ball, i.e. downwards, acceleration is negative (-)
At maximum height, the ball will stop moving, therefore, velocity is zero (0).
Since acceleration due to the force of gravity acts downward, the acceleration is negative (-)
