Physics

Problem

A baseball has a mass of

5.00\,\text{oz}

and is pitched horizontally at

92\,\text{mi h}^{-1}

. [Use

1\,\text{oz}=28.35\,\text{g}

and

1\,\text{mi}=1609\,\text{m}

.] a. (a) Convert the given mass and speed into SI units. b. (b) Calculate the kinetic energy of the baseball, giving the result correct to three significant figures. c. (c) A second baseball is thrown so that its kinetic energy is exactly the same as that found in part (b) but its speed is

40.0\,\text{m s}^{-1}

. Find the mass of this second baseball in grams.

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