If an object falls with constant acceleration, the velocity of the object must continually change by varying amounts, depending on its speed.
be constant also.
continually change by the same amount each second.
continually decrease.
none of the above

continually change by the same amount each second

Explanation:

We all are aware  with the fact that a car speeds is increased when we put our feet  on the accelerator. The rate at which the particle's velocity change with time is called its acceleration. If the particle's velocity changes with constant rate, then its rate is called the constant acceleration.

Since the basic units are meter and seconds. And the SI unit of velocity is and acceleration's SI unit is

For example if the velocity is change from 2 to 4 m/s in 1 sec its acceleration is and again its velocity is change with 4 m/s to 6 m/s will again give constant acceleration in 1 s is .

c.the charges if the proton and electron and gravity

wavelength divides in half and speed stays the same.