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TEWhen a truck is moving at 80 km/h and a person is launched backward at the same speed relative to the truck, their velocities combine based on relative motion. From the ground’s perspective, the truck’s 80 km/h forward motion and the person’s 80 km/h backward motion cancel each other, making the person appear momentarily stationary before gravity pulls them down.
This demonstrates relative velocity, where motion depends on the observer’s frame of reference. Inside the truck, the person moves backward quickly, but outside, the net horizontal speed briefly becomes zero.
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