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The formula in finding the kinetic energy of an object is  \frac{1}{2}mv^{2} .

KE =  \frac{1}{2}mv^{2}
     = ( \frac{1}{2})(7.0 kg) (5 m/s)^{2}
     = (3.5 kg)(25 m/s)
     = 87.5
     *We're going to round it off to its least significant value so that we can get the final answer.

The kinetic energy of the ball is 90 J.