Unformatted text preview: zero – which means there is only one root. The cars are side by side only once at t = 4 s. (c) A sketch is shown below. It consists of a straight line ( x A ) tangent to a parabola ( x B ) at t = 4. (d) We only care about real roots, which means 10 2 − 2( − 20)( a B ) ≥ 0. If  a B  > 5/2 then there are no (real) solutions to the equation; the cars are never side by side. (e) Here we have 10 2 − 2( − 20)( a B ) > 0 ¡ two real roots. The cars are side by side at two different times....
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This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.
 Spring '06
 Stoler
 Physics

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