Questions 20–22 refer to the following scenario: A 2 kg ball with a velocity of -20 m / s collid

Name: Problem 22, Chapter 14: Cracking The AP Physics 1 Exam
Uploaded: 2021-04-08T15:04:26-08:00
Duration: 1 min 14 s
Channel: Sachin Rao
Description: Questions 20–22 refer to the following scenario: A 2 kg ball with a velocity of -20 m / s collides with the wall and bounces back with a velocity of 10 m / s How much work did the wall do on the ball? (A) -300 J (B) -400 J (C) -750 J (D) -1,000 J

step 1 This problem we have to find how much work did the wall do on the wall. So we know that net work

Question

Questions 20–22 refer to the following scenario: A 2 $\mathrm{kg}$ ball with a velocity of $-20 \mathrm{m} / \mathrm{s}$ collides with the wall and bounces back with a velocity of 10 $\mathrm{m} / \mathrm{s}$ How much work did the wall do on the ball? (A) $-300 \mathrm{J}$ (B) $-400 \mathrm{J}$ (C) $-750 \mathrm{J}$ (D) $-1,000 \mathrm{J}$

   Questions 20–22 refer to the following scenario:
A 2 $\mathrm{kg}$ ball with a velocity of $-20 \mathrm{m} / \mathrm{s}$ collides with the wall and bounces back with a velocity of 10 $\mathrm{m} / \mathrm{s}$
How much work did the wall do on the ball?
(A) $-300 \mathrm{J}$
(B) $-400 \mathrm{J}$
(C) $-750 \mathrm{J}$
(D) $-1,000 \mathrm{J}$

Cracking The AP Physics 1 Exam

Robert Franek 1st Edition

Chapter 14, Problem 22

Instant Answer

Solved by Expert Sachin Rao

04/08/2021

Step 1

This can be represented as: \[W = K_{final} - K_{initial}\] Show more…

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Questions 20–22 refer to the following scenario: A 2 $\mathrm{kg}$ ball with a velocity of $-20 \mathrm{m} / \mathrm{s}$ collides with the wall and bounces back with a velocity of 10 $\mathrm{m} / \mathrm{s}$ How much work did the wall do on the ball? (A) $-300 \mathrm{J}$ (B) $-400 \mathrm{J}$ (C) $-750 \mathrm{J}$ (D) $-1,000 \mathrm{J}$

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Key Concepts

Work-Energy Theorem

This theorem states that the net work done on an object by forces is equal to the change in its kinetic energy. It is a fundamental principle that connects the work done by forces to the variation in the energy of the object, enabling one to calculate work by comparing initial and final kinetic energies.

Kinetic Energy

Kinetic energy is the energy that an object possesses due to its motion. It is calculated using the formula (1/2)mv², where m is the mass and v is the speed of the object. This concept is central to analyzing problems involving work and energy, regardless of the direction of motion, as kinetic energy depends solely on the speed.

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