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March 24, 2017

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9. A toy is thrown vertically downwards from the top of a building and has an initial velocity of 1.5 m/s. If the height of the building is 25 m, determine
i. the velocity with which the toy hits the ground
ii. the time taken for the toy to fall

  • eep - ,

    h = 25 - 1.5t - 4.9t^2
    v = -1.5 - 9.8t

    set h=0 and solve for t
    use that t to get the velocity at impact.

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