2. a) A ball has an initial speed external forces act on the ball. After these forces act, the speed of the ball is 0.5v, m/s. Have the forces done positive or negative work? Do you need to know how the gravitational potential energy of the ball changed before you can answer the question? Explain. 4.0 m/s. Suppose several %3D b) Suppose the same forces acts again and the speed drops to 0.25vo m/s. the forces do more work during the first or second halving of the speed?

2. a) A ball has an initial speed external forces act on the ball. After these forces act, the speed of the ball is 0.5v, m/s. Have the forces done positive or negative work? Do you need to know how the gravitational potential energy of the ball changed before you can answer the question? Explain. 4.0 m/s. Suppose several %3D b) Suppose the same forces acts again and the speed drops to 0.25vo m/s. the forces do more work during the first or second halving of the speed?

Name: 2. a) A ball has an initial speed vo =4.0m/s.Supposeseveralexternal f
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Description: 2. a) A ball has an initial speed vo =4.0m/s.Supposeseveralexternal forces act on the ball. After these forces act, the speed of the ball is0.5vo m/s. Have the forces done positive or negative work? Doknow how the gravitational potential energy of t

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

2. a) A ball has an initial speed vo =
4.0
m/s.
Suppose
several
external forces act on the ball. After these forces act, the speed of the ball is
0.5vo m/s. Have the forces done positive or negative work? Do
know how the gravitational potential energy of the ball changed before you
can answer the question? Explain.
you
need to
b) Suppose the same forces acts again and the speed drops to 0.25vo m/s.
Do the forces do more work during the first or second halving of the speed?
Physics 1200
VI - 3

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