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# A 4.80-kg watermelon is dropped from rest from the roof of ISBN: 9780321675460 31

## Solution for problem 18E Chapter 6

University Physics | 13th Edition

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Problem 18E

A 4.80-kg watermelon is dropped from rest from the roof of an 18.0-m-tall building and feels no appreciable air resistance. (a) Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. (b) Just before it strikes the ground, what is the watermelon’s (i) kinetic energy and (ii) speed? (c) Which of the answers in parts (a) and (b) would be ?different? if there were appreciable air resistance?

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Solution 18E Here, we shall have to use the equations of potential energy and kinetic energy. The mathematical expression for potential energy is P = mgh…..(1), where m is the mass of the body, g is the acceleration due to gravity and h is the height. 1 2 The mathematical expression for kinetic energy is K = m2 …..(2), here v is the speed of the body. Given, initial speed of the watermelon u = 0 Its mass m = 4.80 kg Height of the building h = 18.0 m 2 We know, acceleration due to gravity g = 9.80 m/s The watermelon is displaced by 18.0 m when it falls from the roof of the building to the ground. (a) Therefore, work done by gravity on the watermelon W g = mgh 2 W g = 4.80 kg × 9.80 m/s × 18.0 m W g = 846.7 J W g 847 J Therefore, the approximate...

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##### ISBN: 9780321675460

Since the solution to 18E from 6 chapter was answered, more than 1199 students have viewed the full step-by-step answer. This full solution covers the following key subjects: watermelon, appreciable, air, roof, resistance. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. University Physics was written by and is associated to the ISBN: 9780321675460. The full step-by-step solution to problem: 18E from chapter: 6 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. This textbook survival guide was created for the textbook: University Physics, edition: 13. The answer to “A 4.80-kg watermelon is dropped from rest from the roof of an 18.0-m-tall building and feels no appreciable air resistance. (a) Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. (b) Just before it strikes the ground, what is the watermelon’s (i) kinetic energy and (ii) speed? (c) Which of the answers in parts (a) and (b) would be ?different? if there were appreciable air resistance?” is broken down into a number of easy to follow steps, and 75 words.

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