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March 3, 2015

March 3, 2015

Posted by **Jennifer** on Friday, January 29, 2010 at 10:15pm.

What is the time before the cars meet

the distance a traveled before meeting b

the relative speed at which the cars hit.

- Physics -
**drwls**, Saturday, January 30, 2010 at 12:42amCall x = 0 the location were Car A starts. Call that car's location X1.

Car B then starts at x = 2400. Call its location X2

X1 = 40 t

X2 = 2400 - 10 t - t^2.

They meet when X1 = X2.

40t = 2400 -10 t - t^2

Rearrange that to read

t^2 +50 t -2400 = 0

(t +80)(t-30) = 0

Solve for the time t that is a positive root of that equation.

Use that value of t to solve for the location where they meet. The relative velocity is V1 - V2. But V2 is negative, so you end up adding the speeds of the cars at time t.

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