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    bargiy's Avatar
    bargiy Posts: 3, Reputation: 1
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    #1

    Nov 2, 2011, 10:03 AM
    What is height for a ball to drop 2 seconds?
    What is total height of a ball if its thrown downward.its time before strike ground is 2 seconds and its height is 3/4 of it total height so what is the total height?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Nov 2, 2011, 10:26 AM
    Please clarify your question. The ball is thrown downward - but at what speed? And what do you mean by "its height is 3/4 if it total height?" Also - when you provide clarification please also show us how you have attempted to solve the problem yourself, and we'll help you along if you get stuck.
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    bargiy Posts: 3, Reputation: 1
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    #3

    Nov 2, 2011, 11:21 AM
    Sorry my english is not very good. Try undrestant me . The ball is droped not thrown so it doesn't need a speed to drop.the height in that 2 seconds is 3/4 of its total height.so what is the total height?I don't know how to solve it..

    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Nov 2, 2011, 11:34 AM
    OK - what you want to determine is how far a ball drops in 2 seconds. Use the formula:



    where 'g' is acceleration due to gravity = 9.8 m/s^2 and 't' is the time in seconds. This gives you the height 'd' that it drops in 't' seconds. If that height is 3/4 of some other height, multiply 'd 'by 4/3. Hope this helps.
    bargiy's Avatar
    bargiy Posts: 3, Reputation: 1
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    #5

    Nov 2, 2011, 12:11 PM
    OK thank you..
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