If you were in the back of a moving truck with the slider open and you jumped would you remain in place where you jumped causing the truck to move forward while you would fall out? And how hard would you hit the ground? Would it be harder due to the speed of the truck?
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If the truck is travelling at a constant speed, you would land at the same spot on the truck and at the same speed as if the truck was stopped.
Only if the truck was speeding up or slowing down would your landing position change.
You are in the same 'inertial frame of reference' as the truck.
Consider this; when you jump from the ground and land again, you land in the same spot, but the earth is spinning on it's axis at the rate of one revolution every 24 hours. At the equator you would be travelling at approximately 1670km/h.
Only if the truck was speeding up or slowing down would your landing position change.
You are in the same 'inertial frame of reference' as the truck.
Consider this; when you jump from the ground and land again, you land in the same spot, but the earth is spinning on it's axis at the rate of one revolution every 24 hours. At the equator you would be travelling at approximately 1670km/h.
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so about 8mph
Would not hurt when you fall back out
Would not hurt when you fall back out