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How much work is done by a pitcher in throwing a 0.2 $\mathrm{kg}$ ball at a speed of 30 $\mathrm{m} / \mathrm{s}$ ?(A) 3 $\mathrm{J}$(B) 9 $\mathrm{J}$(C) 30 $\mathrm{J}$(D) 90 $\mathrm{J}$

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Chapter 14

Practice Test 4

Section 1

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the problem. We have to find how much work is done by a picture in throwing a 0.2 kg ball at a speed of 30 m per second mass of ball, 0.2 kg and speed is 30 m per second. So here we know that it has some kinetic energy. So this kind of energy comes from the work. Done. Buy a picture. So this program should be equal to this kind of energy which is half and the square half mass 0.2 into vis 30 square. So this is a cold 0.1. Multiply with 30 square. So this is equal to 90 jewels. So wagon is equal to 90 June. Now we will check our options Option B s 90 jewel auction. They will be correct. Thank you.

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