Chapter 237P2.38Take the original point to be when Sue notices the van. Choose the origin of the x-axis at Sue’s car.For her we have xis=0, vis=30 0. ms,as=−200. ms2so her position is given byxt xvtatttsisiss()= ++=+−1230 01222..ms2afch.For the van, xiv=155 m, viv=500. ms,av=0 andattvivivv+=++121555 0002saf.To test for a collision, we look for an instant tcwhen both are at the same place:30 0155 5 00025015522tttccc−= +=−+From the quadratic formulatc=±( )−()=25 025 04 155213 62. s or 11 4s.The smaller value is the collision time. (The larger value tells when the van would pull ahead again
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .