145 g baseball is thrown vertically up with a speed of 25 m/s. What is its initial kinetic energy? o Using the equations of motion, determine the maximum height reached by the baseball. What is its gravitational potential energy at the maximum height?
145 g baseball is thrown vertically up with a speed of 25 m/s. What is its initial kinetic energy? o Using the equations of motion, determine the maximum height reached by the baseball. What is its gravitational potential energy at the maximum height?
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 65P: A block of mass 200 g is attached at the end of a massless spring of spring constant 50 N/m. The...
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Question
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Transcribed Image Text:Kinetic energy(Ex) is energy an object has because of
v has kinetic energy, Ex =mv².
%3D
Potential energy (U) is energy associated with forces that depend on the position or configura
of bodies.
Gravitational potential energy is given by, U, = mgh where h is the height of the object of n
m above a given reference point.
Elastic potential energy is given by, Uet =kx2 for a stretched or compressed spring, where
the displacement from the unstretched position and k is the spring's constant.
%3D
Еxample 1
A 145 g baseball is thrown vertically up with a speed of 25 m/s.
a) What is its initial kinetic energy? O
b) Using the equations of motion, determine the maximum height reached by the baseball.
c) What is its gravitational potential energy at the maximum height?
Example 2
A horizontal spring, whose spring constant is 900 N/m, is attached to a wall as shown in Fig,70
A block is then pressed against the spring and is compressed 6.0 cm as shown in Fig.7 (b).
(a)
X = -6.0cm
0000
(b)
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