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6 February, 07:14

A ball is thrown straight up at 20 m. What is the balls velocity as it hits the ground?

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  1. 6 February, 10:16
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    The velocity of the ball as it hit the ground = 19.799 m/s

    Explanation:

    Velocity: Velocity of a body can be defined as the rate of change of displacement of the body. The S. I unit of velocity is m/s. velocity is expressed in one of newtons equation of motion, and is given below.

    v² = u² + 2gs ... Equation 1

    Where v = the final velocity of the ball, g = acceleration due to gravity, s = the height of the ball

    Given: s = 20 m, u = 0 m/s

    Constant: g = 9.8 m/s²

    Substituting these values into equation 1,

    v² = 0 + 2*9.8*20

    v² = 392

    v = √392

    v = 19.799 m/s.

    Therefore the velocity of the ball as it hit the ground = 19.799 m/s
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