This experiment spectacularly showed how relative speed works.

    • Evil_Shrubbery@thelemmy.club
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      5 days ago

      He is facing backwards so if you are differentiating between acceleration & deceleration then he was accelerated bcs he was facing the same way we the vector.

      • ReluctantMuskrat@lemmy.world
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        5 days ago

        Which way he’s facing makes no difference. Relative to the ground, by which we are measuring his speed and on which he comes to rest, he is decelerating. Just as a seat belt presses against your waste and chest to decelerate you when braking hard, the chair he’s sitting in is doing the same, but against his entire back.

        I will however agree relative to the moving vehicle he is accelerating in the opposite direction of motion, but that not the frame of reference by which we’ve documented his moving velocity.