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A baseball player hits a 5.1 -oz baseball with an initial velocity of $140 \mathrm{ft} / \mathrm{s}$ at an angle of $40^{\circ}$ with the horizontal as shown. Determine $(a)$ the kinetic energy of the ball immediately after it is hit, $(b)$ the kinetic energy of the ball when it reaches its maximum height, $(c)$ the maximum height above the ground reached by the ball.

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a .$=97.0109 \approx 97 \mathrm{ft} \cdot \mathrm{lb}$b. $=56.9283 \approx 57 \mathrm{ft} \cdot \mathrm{lb}$c. $y_{1}=y_{0}+h=126+2=128 \mathrm{ft}$

Physics 101 Mechanics

Chapter 13

Kinetics of Particles: Energy and Momentum Methods

Work

Moment, Impulse, and Collisions

Energy Conservation

Cornell University

University of Washington

Hope College

McMaster University

Lectures

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.

04:05

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.

04:23

A baseball player hits a 5…

07:02

02:06

'A baseball player hi…

05:14

'PROBLEM 13.3A ba…

01:43

The bascball player $A$ hi…

01:21

A baseball outfielder thro…

01:51

Review. A baseball outfiel…

01:40

06:05

A baseball is thrown from …

04:06

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