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 Sep 11th 2016, 05:57 PM #1 Junior Member   Join Date: Sep 2016 Posts: 1 Mastering Physics help! A rock is kicked horizontally at v0 = 19 m/s from a hill with a 45∘ slope. How long does it take for the rock to hit the ground?
 Sep 12th 2016, 07:53 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,347 The rock hits the side of the 45 degree slope when its horizontal displacement equals its vertical displacement - do you see why that is? The rock's horizontal displacement as a function of time is x(t) = v_0 t, and its vertical displacement is y(t) = (1/2)gt^2. Set these equal, and solve for t. HallsofIvy likes this.

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