Answer:
From point A to point B there is 15sec and from point C to point D there is 9sec.
Explanation:
Acceleration of an object is depended upon the net force acting open the object and the mass of the object
Answer:
It will not change
Explanation:
The period of oscillation of a mass-spring system is given by

where
T is the period
m is the mass hanging on the spring
k is the spring constant
As we see from the formula, the period of oscillation does not depend on the amplitude of the motion: therefore, if we change the amplitude, the time for one oscillation will not change.
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force