A goalie kicks a soccer ball straight vertically into the air. It takes 5.00 s for the ball to reach its maximum height and come back down t

Question

A goalie kicks a soccer ball straight vertically into the air. It takes 5.00 s for the ball to reach its maximum height and come back down to the level of the crossbar. Assume the crossbar of a soccer goal is 2.44 m above the ground. (a) How fast was the ball originally moving when it was kicked. (b) How much longer would it take the ball to reach the ground?

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Linh Đan 4 years 2021-08-22T03:58:43+00:00 1 Answers 59 views 0

Answers ( )

  1. kimchi2
    0
    2021-08-22T04:00:05+00:00
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    Answer:

    (a)    vo = 24.98m/s

    (b)    t = 5.09 s

    Explanation:

    (a) In order to calculate the the initial speed of the ball, you use the following formula:

    y=y_o+v_ot-\frac{1}{2}gt^2      (1)

    y: vertical position of the ball = 2.44m

    yo: initial vertical position = 0m

    vo: initial speed of the ball = ?

    g: gravitational acceleration = 9.8m/s²

    t: time on which the ball is at 2.44m above the ground = 5.00s

    You solve the equation (1) for vo and replace the values of the other parameters:

    v_o=\frac{y-y_o+1/2gt^2}{t}        

    v_o=\frac{2.44m-0.00m+1/2(9.8m/s^2)(5.00s)^2}{5.00s}\\\\v_o=24.98\frac{m}{s}

    The initial speed of the ball is 24.98m/s

    (b) To find the time the ball takes to arrive to the ground you use the equation (1) for y = 0m (ground) and solve for t:

    0=24.98t-\frac{1}{2}(9.8)t^2\\\\t=5.09s

    The time that the ball takes to arrive to the ground is 5.09s

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