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22 January, 04:55

Energy conservation

. A pool ball of mass m is shot off a 0.68 m high pool table and hits the floor with a speed

of 6.0 m/s. What was the ball's initial velocity?

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Answers (1)
  1. 22 January, 05:21
    0
    7.328m/s

    Explanation:

    Given parameters:

    height of table = 0.68m

    final velocity of the ball = 6m/s

    Unknown:

    Initial velocity of ball = ?

    Solution:

    To solve this problem, we are going to employ the appropriate motion equation.

    We must understand that this fall occurs in the presence of gravity;

    V = U + 2gH

    Where;

    V is the final velocity

    U is the initial velocity

    g is the acceleration due to gravity

    H is the height of the pool table

    Since U is the unknown, let us make it the subject of the expression;

    U = V - 2gH

    U = 6 - (2 x 9.8 x 0.68) = 7.328m/s (deceleration)
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