How does the mass of an object that is moving at constant sped affect the amount of force needed to stop that object form moving?

Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force.

pe = weightxheight = 2000x1000=2,000,000joules

not moving. pos accel,