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    carollo8205's Avatar
    carollo8205 Posts: 1, Reputation: 1
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    #1

    Sep 21, 2010, 09:19 PM
    How do you find the magnitude?
    The problem says: You slap a hockey puck towards the goal 20 m away. If the puck's initial speed is 51 m/s and it take 0.4 s to reach the goal, what is the magnitude of its acceleration?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Sep 22, 2010, 02:34 AM

    Assuming that there is a constant acceleration on the hockey puck, you can use the formula:



    s is the displacement, here 20 m,
    u the initial speed,
    t the time it takes
    a is the acceleration for you to find.

    Since you are asked for the magnitude, take the absolute (positive/modulus) of the value you get if it is negative.
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