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  3. a rock is thrown with an initial velocity of 30 m/

A rock is thrown with an initial velocity of 30 m/s at an angle of 60°...

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Civil Engineering

A rock is thrown with an initial velocity of 30 m/s at an angleof 60° above the horizontal from a height of 1.5 m toward a cliff.After 4 seconds, the rock lands on the top edge of the cliff.

(a) Calculate the height of the cliff.

(b) Calculate the maximum height reached by the rock along itstrajectory

(c) Determine the speed of the rock just before hitting thecliff.

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