Using Newton's second law and kinematics we find that the correct answer are:
Kinematics studies the motion of bodies, establishing relationships between the position, velocity and acceleration of bodies.
v = v₀ + a t
y = v₀ t + ½ a t²
Where v i de veloicity, a the acceleration,y the position and t the time
Newton's second law states that force is proportional to the mass and acceleration of bodies
F = ma
Where F es the force, m the mass ( scalr) and a de acceleraction
In the experiment shown, the car starts with zero initial velocity from a zero initial position, as the hanging mass creates a force that pulls the car, it increases its position and speed as time stops.
Therefore the position and speed are changing with time.
As the hanging mass is constant the applied force is constant consequently due to Newton's second law the mass of the body and its acceleration must be constant
In summary the acceleration, the mass and the applied force are constant.
The variable magnitude with time is the speed
In conclusion using Newton's second law and kinematics we find that the correct answer is
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