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Dec 16, 2014 at 5:57 comment added AmigoNico Would you really say that friction is required to accelerate the raindrops? If a raindrop falling into the wagon slid frictionlessly to the back, would it not be pushed by -- and therefore push back against -- the rear wall of the wagon?
Dec 15, 2014 at 9:58 comment added mpv @Benjam If the raindrops are falling at the same velocity as the wagon, then the wagon does not slow down. The mass of the wagon is increasing, but also the momentum is increasing: each raindrop is adding its momentum to the wagon.
Dec 15, 2014 at 7:47 comment added Benjam What if the raindrops happen to be falling with a horizontal velocity exactly equal to that of the wagon?
Dec 15, 2014 at 3:39 history edited user65081 CC BY-SA 3.0
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Dec 15, 2014 at 3:08 history answered Alessandro Power CC BY-SA 3.0