player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory, which is true?  both the velocity and the acceleration of the soccer ball are zero.  neither the ball's velocity nor its acceleration is zero.  the ball's acceleration is zero, but its velocity is not zero.  the ball's acceleration points upward

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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A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory, which
is true?
 both the velocity and the acceleration of the soccer ball are zero.
 neither the ball's velocity nor its acceleration is zero.
 the ball's acceleration is zero, but its velocity is not zero.
 the ball's acceleration points upward.

 

Why is it more difficult to start pushing a couch from rest than it is to maintain its motion at constant velocity?
 the normal force is larger when the couch is at rest.
 Because μk > μs
 It only seems more difficult
 Because μs > μk

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