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In physics, motion cannot be defined without reference to time. Basic motion involves translation through distance over time.

Velocity is given by speed and direction. An acceleration describes a change in either speed or direction.

These Newtonian definitions depend upon time flowing at a constant rate, but nothing changes for the objects if time flows at a different rate altogether. If time stops, motion, velocity, and acceleration all stop.

I really don’t see the point of denying a basic physical parameter.

It's going to be an uphill battle for you to truly understand Quantum Mechanics. Einstein, and Galileo long before, made a clear distinction between LOCAL and GLOBAL. Locally the earth is flat and unmoving, globally it is round, spinning and orbiting the sun. We have a saying in physics : when all else fails, go back to Newton. Newton's First law : an object(collection of fermions) will remain at rest, or move in a straight line(momentum) at a constant velocity(ignoring curvilinear gravity effects)until an external force(mass-time)is impressed upon it. Momentum is mv, mass is mv^2/2, an intergral/derivative relationship. Locally the collection of fermions feels NOTHING in Momentum, it's in a balanced Wave=Particle state. Globally, you as an external observer with your stop watch, are in an unbalanced W not=to P or mass-time state(ie, using Kinetic Energy at some delta rate). The formulas are : t=dKE=m=(W not=to P) and not-t=PE=M=(W=P). W here means Matter Waves, the other, hidden, invisible half of your existence. Just as light(the EM spectrum) is WAVES as well as PARTICLES, so is matter(ie, fermions, ie, electrons, protons, neutrons, quarks)also WAVES as well as particles. You don't SEE them, you feel them as decelerations/weight(W>P)in your "time-eye" body, as the "observer". Physicists use the term : "collapse of the wavefunction" but I prefer "over running matter wave energy in newtons of wave FORCE". Think of a surf wave slamming into a cliff/seawall, that's how "time" works, with your clock, with your haptics/neural network, stopping at your brain. Try this simple CM experiment : throw a baseball back and forth between your hands. When you accelerate it(coulomb repulsion of electron clouds actually)you have increased the Particle velocity(Pv)but not the complementary matter Wavelength(Ws for Wave shape or spectrum, or lambda), it ALSO has to be increased to match that higher Pv, and thus reach a higher momentum level(W=P). Now, you NEVER feel that local, internal increase in Ws anymore than you do in freefall. What YOU feel is a resistance due to your throwing hand being DEcelerated. Newton's Third : For every action there is an equal and opposite reaction(that's how rockets work). Thus the hidden matter wave energy you are investing in the accelerated baseball is INVISIBLE, GONE into the "bank". Einstein put it as either keeping your money in your pocket or putting it in the bank(w/o deposit slips), but you can't have it both ways! That would violate the First Law of Thermodynamics : Energy is never created or destroyed, only transferred. Thus, LOCALLY the increased +dWs of acceleration is NEVER felt, sensed, detected; even if it's your own body. Thus you don't feel acceleration energy going INTO your body(WP). Thus the impact energy of catching the baseball is that earlier acceleration coming back out(withdrawal slip not included)as deceleration. So try it with any small, dense object : you're throwing matter wave energy back and forth. Real simple if you understand QUANTUM MECHANICS....