if you were headed on an even platform or an ascending gradient, you would need to maintain a degree of throttle to continue constant velocity. That degree of throttle would of course depend on the gradient.
But
If your trajectory had changed & your path is now descending, preserving gradual, even pressure on the deceleration pedal OR handbrake lever, will be required to achieve linear velocity.
Another way to adhere to a constant downward movement is to keep the vehicle in a lower gear, be it the vehicle in question has an automatic/semi-automatic/manual transmission.
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