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19 June, 21:43

A pitcher throws a baseball towards home plate. The baseball, which has a mass of 142 g, approaches the plate with 128 J of kinetic energy.

Calculate the speed of the baseball.

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  1. 20 June, 01:40
    0
    Mass=142g

    K. E=128 J

    Speed or Velocity=?

    K. E=1/2*m*v^2

    128=1/2*142*v^2

    128=72*v^2

    v^2=128/72

    v^2=1.777

    by taking square rt

    v = 1.333ms-1

    so the speed will be 1.333 ms-1
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