1. The vehicle, the person and the stone are all moving through the air, thus the resultant friction against the motion of the bodies is negligible.

    The vehicle, the person and the stone are all moving through the air, thus the resultant friction against the motion of the bodies is negligible.

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  2. The ball falls back to the person (the thrower) since its horizontal velocity is not affected by the verticle projection provided friction due to air particles is negligible.

    The ball falls back to the person (the thrower) since its horizontal velocity is not affected by the verticle projection provided friction due to air particles is negligible.

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