A ball is thrown from a hand straight upwards under the influence of gravity with an initial speed of 10 m/s. The ball returns to the hand with a speed of 20 m/s downwards. Which of these is not a possible explanation? a) The ball lost some of its mass and returned to the hand with a smaller mass. b) The ball encountered an additional force along the way before returning to the hand. The ball was thrown on a planet with a different constant of gravity

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