Two rocks are launched from the top of a cliff of a khown speed of vo and an angle 0 relative to the vertical. The other rock is launched horizontally with an unknown speed of Vo. Though each rock takes a different path and is in the air a different amount of time, they both land at the same distance R from the cliff. One rock is launched upward with same distance R from the cliff. Solve all parts symbolically in terms of the known variables vo, g, 0, and h. Assume there is no air resistance.  (a) Find the distance R where the rocks land as measured from the cliff.  (b) Find an expression for the time that passes from when the first rock lands to when the second rock lands.  (c) Determine the launch speed Vo of the horizontally launched rock. M (d) Compare the work done by gravity on the rocks.

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Projectile Motion