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22 September, 18:39

A soccer ball player bounces the ball off her head, changing the velocity of the ball. She changes the x-component of the velocity of the ball from vix = 7.9 m/s to vfx = 5.9 m/s and the y-component from viy = - 3.4 m/s to vfy = 4.5 m/s.

If the ball has a mass of 0.40 kg and is in contact with the player's head for 7.1 ms, determine the direction of the impulse (in degrees counterclockwise from the + x-axis) delivered to the ball.

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  1. 22 September, 19:36
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    change in momentum along x axis = mass (final velocity - initial velocity)

    =.4 (5.9 - 7.9)

    = -.8 kg m / s

    change in momentum along y axis = mass (final velocity - initial velocity)

    =.4 (4.5 + 3.4)

    = 3.16 kg m/s

    Force along x axis be Fx

    Fx. t = change in momentum along x axis = -.8

    Fy. t = change in momentum along y axis = 3.16

    Direction of impulse =

    Tanθ = Fy. t / Fx. t, θ is angle from x axis along anticlockwise direction.

    = 3.16 / - 0.8.

    = - 3.95

    θ = 165.8 degree from positive x - axis. anticlockwise.
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