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PEP 111 QUIZ 2 SOLUTIONS

# PEP 111 QUIZ 2 SOLUTIONS - !J/OM ~:mailnck c St~ r ~1 ~,i.~...

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!J/OM ~ rnck c- ,i_ .~ , t Print your name and ::mail ~~1 ~ St~~ f(JV RI RL Rk . . . . . --) Stevens Institute of Technology PEP111 - Mechanics Quiz 2 - Friday, February 11, 2011 - .... ,. Pledge Upon completion of this exam, Sign the Stevens Honor Code Pledge: (}u)z 2 Soluho.-, "I pledge my honor that I have abided by the Stevens Honor System" Instructions This is a closed book exam. Complete all parts of each problem. You must show all your work. Write neatly and USE A STRAIGHTEDGE RULER where appropriate. Score Problem: ( 1 0) Formulas you may fmd useful. 1 D . ds dv, - motton: v =- a.=- 'dt 'dt Constant acceleration in 1-D: v 1 , = v;, +a,& s 1 = s; + V;.,& +±a. ( & ) 2 v;. = v;: + 2a,& Q adra . E . If" 2 b 0 -b ± .j bz - 4ac u tic quation: at + t + c = = ----- 2a PEP Ill Quiz 2- l --j·l ([)

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··~--~···· ""~---~ .... ·-~-----·- Print your name and email Problem: A car moves down a straight road at a speed of 39 km/hr. The driver sees an object blocking the road ahead and instantly applies the brakes and comes to rest just before hitting the object. Assuming the brakes cause the vehicle to undergo CONSTANT DECELERATION of I. 7 rnls 2 , answer the following: (a) Draw a sketch of the problem with a labeled coordinate axis.
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