Answered: An object with a mass of 56.0 kg is…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter6: Energy Of A System

Section: Chapter Questions

Problem 3P: A block of mass m = 2.50 kg is pushed a distance d = 2.20 m along a frictionless, horizontal table...

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An object with a mass of 56.0 kg is fired with an initial speed of 1.40 10² m/s at an angle of 30.0° above the horizontal from a 142 m high cliff (take ground level to be y = 0 m).

(a) Determine the initial total mechanical energy (in J) of the system of the projectile and the earth. J

(b) If when the projectile is at its maximum height of y = 346 m, it is traveling 99.2 m/s, determine the amount of work (in J) that has been done on the projectile by air resistance. J

(c) What is the speed (in m/s) of the projectile immediately before it hits the ground, if air resistance 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?

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