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    serenitymantra's Avatar
    serenitymantra Posts: 28, Reputation: 1
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    #1

    Sep 22, 2008, 12:40 PM
    Horizontal Vectors
    A car drives horizontally off a 73m high cliff at a speed of 27 m/s. Ignore air resistance.

    How long will it take the car to hit the ground?

    How far from the base of the cliff will the care hit?

    Any guidance will help. Thanks!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Sep 22, 2008, 01:08 PM

    You break the problem into two parts - the horizontal motion and the vertical. Start with the vertical - do you know how to determine how long it takes something to fall 73m? It doesn't matter that the car has an initial horizontal velocity - the time it takes to reach the ground is exactly the same as dropping a stone from a 73m high cliff.

    Once you have figured out how long it takes to hit the ground, you can determine how far horizontally it moves by multiplying its initial horizontal velocity by the time.
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