# HW_2 - P112 Fall 2008 Homework#2 due at your second section...

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P112 Fall 2008 Homework #2, due at your second section, Week of Sep 8-12, 2008 Reading: 3.1-3.3, 3.5 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A car with an initial velocity v 0 brakes to a stop with constant deceleration in a time t. If the initial velocity was twice as large but the constant deceleration was half as large, the time to stop would be A. 8t B. 4t C. 2t D. t E. 0.5 t 2. A jet plane is flying at a constant altitude. At time t 1 =0 it has components of velocity v x =90 m/s, v y =110 m/s. At the time t 2 = 30.0 s the components are v x =- 170 m/s and v y =40 m/s. a) Sketch the velocity vectors at t 1 and t 2 . How do these vectors differ? For this time interval calculate b) the components of the average acceleration; c) the magnitude and the direction of the average acceleration. 3.

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## This note was uploaded on 10/04/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.

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HW_2 - P112 Fall 2008 Homework#2 due at your second section...

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