11. Your classmate is still a bit confused by the experiment where the ball is thrown directly upwards, and saysthe following: "while the ball is moving upwards, its velocity points upwards and it has an accelerationpointing upwards also."How would you convince your classmate that their argument is incorrect?

Answered: Your classmate is still a bit confused…

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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11. Your classmate is still a bit confused by the experiment where the ball is thrown directly upwards, and says
the following: "while the ball is moving upwards, its velocity points upwards and it has an acceleration
pointing upwards also."
How would you convince your classmate that their argument is incorrect?

Expert Solution

Step 1 :Introduction

In a projectile motion , the only acceleration acting on the object is the acceleration due to gravity , which is , $g = 9.8 m / s^{2}$ and the direction of the acceleration is towards the ground , because , the gravitational force is acting downwards .But the direction of velocity of the object will be same as the direction of motion of the object .

This is the reason that as the object goes upwards the velocity of the object is decreasing . According to the Newton's laws of motion , the final velocity of an object is calculated by using the formula $v = u + a t$ , where in this case u is the initial velocity , $a = - g$ is the acceleration and t is the time taken . Thus the final velocity will be $\begin{array}{rcl} v & = & u - g t \\ v & < & u \end{array}$ .

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