COOP_1 10 - Name: _ Section/Instr.: _ Partners: _...

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Name: ______________________________Section/Instr.: ___________________ Partners: __________________________________________________________ Physics 2207, Fall 2010 1 Cornell University Cooperative Problems 1: 1-D Kinematics 1. You are driving your car (let’s define the direction as positive ) at 20 m/s. A van is following you, also at 20 m/s. When you see a fog bank ahead of you, you hit the brakes (let’s define this time as 0 t ). The driver of the van sees your brake lights and applies her brakes at s 0 . 1 t . Both you and the van, when braking, have a constant acceleration of magnitude 2 m/s 0 . 5 until coming to a stop. (a) Draw a sketch of the car and the van at time 0 t , showing their relative positions and indicating the directions of their velocities with arrows. (Other details are not needed!) (b) Sketch the ) ( t v graphs for your car and the van. Label them ) ( car t v and ) ( van t v . (c) At
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COOP_1 10 - Name: _ Section/Instr.: _ Partners: _...

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