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(II) A 145 -g baseball is dropped from a tree 14.0 $\mathrm{m}$ abovethe ground. $(a)$ With what speed would it hit the ground ifair resistance could be ignored? (b) If it actually hits the ground with a speed of $8.00 \mathrm{m} / \mathrm{s},$ what is the average force of air resistance exerted on it?

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A)16.6 $\mathrm{m} / \mathrm{s}$B) $1.09 N,$ upward

Physics 101 Mechanics

Chapter 8

Conservation of Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

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November 2, 2020

Tommy L.

January 14, 2021

Where did the 1.25 come from

Mmm D.

October 27, 2021

Love how you completely neglected to explain where the 1.25 came from I hate indians

:) I hate Indiana Jones

I love Indians

University of Michigan - Ann Arbor

Hope College

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McMaster University

Lectures

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In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

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Okay. For the first part, you're equating kinetic energy to potential energy, ignoring any sort of a resistance. So the initial potential energy is in Call Tio final kinetic energy canned. Ah, here, M times, Judy Times H is equal to 1/2 em. Ah, the square. And so the will be squared of two times two times H, which is two times 9.8 times 14 meters and so velocity would be 16.6 meters per second. Um, therefore, this is fairly straightforward and part B, we are actually trying to find out the force due to a resistance. And so, in this case, your initial potential energy we'll be recalled to kinetic energy plus work done by a resistance of this calling a W C R. So w R will be the difference between those two. So it'll be 1/2. Ah ah, whoops. They want they want half of this queen first, it will be p minus cake you. So it'll be MGH minus 1/2 and V squared. Ah, and self, that's m times CI H minus one and 1/2 B squared. Ah m is 1 45 grams. So it's 0.145 yeah kilograms times she is 9.8 meters per second time's heightens 40 meters Ah minus 1/2 ah times 1.25 meters per second hole squared. So therefore the work done by a resistance is 15.25 Mutants. Now we know force is equal tio or rather force times distance is equal to work done. Therefore the force of air resistance is equal to work down over the distance on DSO that's 15.25 mutants over there since distance to rich it falls, which is 14 meters. Therefore the force of air resistance is 1.9 Newtons and of course it is resisting the false exacting upwards.

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