According to Newton's first law, an object remains at rest until an external force acts upon it, or an object in motion continues to move at a constant speed without accelerating.
Thus, x can solely represent a body coming to a halt. Accordingly, the last option is the most correct.
Answer:
D, C, B, A
Explanation:
The derivative from a velocity-time graph provides the acceleration value.
Segment A

Segment B

Segment C

Segment D

Sorted from the lowest to the highest acceleration:
D, C, B, A
Answer:
The acceleration of the platform is - 1.8 m/s²
Explanation:
The net force on a body causes that body to accelerate in the direction of the resultant force applied.
Setting up the force equilibrium for the configuration:
ma = 800 - mg
100a = 800 - 100×9.8
100a = - 180
100a = - 180
a = - 1.8 m/s²
This indicates that the body is falling downward.
a) The force's magnitude is

, and it acts in the direction from south to north, meaning upward. b) The force's magnitude is 
, with the direction pointing towards the west. c) The magnitude of the force is 
, indicating zero force since the magnetic field aligns parallel to the current (south to north). d) Our conclusion is that the magnetic force is not substantial enough to create impactful consequences at a standard household current of 1.5 A.