---
title: "On a frictionless horizontal air table, puck A (with mass \\( 0.249 \\) \\( \\text{kg} \\)) is moving toward puck B (with mass \\( 0.375 \\) \\( \\text{kg} \\)), which is initially at rest. After the collision, puck A has velocity \\( 0.115 \\) \\( \\text{m/s} \\) to the left, and puck B has velocity \\( 0.645 \\) \\( \\text{m/s} \\) to the right."
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/91376/"
date_modified: "2025-05-08T01:23:41+00:00"
---

# On a frictionless horizontal air table, puck A (with mass \( 0.249 \) \( \text{kg} \)) is moving toward puck B (with mass \( 0.375 \) \( \text{kg} \)), which is initially at rest. After the collision, puck A has velocity \( 0.115 \) \( \text{m/s} \) to the left, and puck B has velocity \( 0.645 \) \( \text{m/s} \) to the right.

On a frictionless horizontal air table, puck A (with mass \( 0.249 \) \( \text{kg} \)) is moving toward puck B (with mass \( 0.375 \) \( \text{kg} \)), which is initially at rest. After the collision, puck A has velocity \( 0.115 \) \( \text{m/s} \) to the left, and puck B has velocity \( 0.645 \) \( \text{m/s} \) to the right.

**Part a)** What was the speed \( v_{A_i} \) of puck A before the collision? *(3 points)*

**Part b)** Calculate \( \Delta K \), the change in the total kinetic energy of the system that occurs during the collision. *(3 points)*


*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/91376/*