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    kendalashley's Avatar
    kendalashley Posts: 1, Reputation: 1
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    #1

    Oct 6, 2010, 07:56 PM
    Grade 11 kinematics questions
    Question 1: An object is thrown straight up into the air from the top of a building at a velocity of 15 m/s. If it hits the ground in 8.0 seconds, what is the height of the building? Ignore air resistance.


    Question 2: An object is thrown straight up into the air from the top of a building at a velocity of 12 m/s. If it hits the ground in 8.0 seconds, what is the speed of the object when it hits the ground? Ignore air resistance.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 7, 2010, 03:37 AM

    What have you tried so far?

    1. Use

    where s is the vertical displacement,
    u the initial speed.
    t the time taken.
    a the acceleration due to gravity.

    2. Here, you can use

    where v is the final velocity of the object when it hits the ground.

    Post what you get! :)
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