A 60.0-kg projec where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? (Give your answer te 7.16e5 X J (b) Suppose the projectile is traveling 102.1 m/s at its maximum height of y = 384 friction? -1.79e5

A 60.0-kg projec where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? (Give your answer te 7.16e5 X J (b) Suppose the projectile is traveling 102.1 m/s at its maximum height of y = 384 friction? -1.79e5

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter8: Potential Energy And Conservation Of Energy

Section: Chapter Questions

Problem 81AP: Repeat the preceding problem, but this time, suppose that the work done by air resistance cannot be...

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Question

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A 60.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 144 m/s from the top of a cliff 168 m above level ground,
where the ground is taken to be y = 0.
(a) What is the initial total mechanical energy of the projectile? (Give your answer to at least three significant figures.)
7.16e5
X J
(b) Suppose the projectile is traveling 102.1 m/s at its maximum height of y = 384 m. How much work has been done on the projectile by air
friction?
-1.79e5
(c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the
projectile when it is going down as it did when it was going up?
94.7
m/s
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