Homework Help: PHYSICS

Posted by PHY on Monday, October 17, 2011 at 9:37am.

a car traveling at a constant velocity of 30 m/sec passes an intersection at time t=0 45 seconds later a second car passes the same intersection and its traveling in the same direction at a constant velocity of 55 m/sec.

when does the second car overtake the first car?

how far have the cars traveled when this happens?

PHYSICS - Henry, Tuesday, October 18, 2011 at 12:05pm
When car #2 catches up, their distance from starting point will be equal:

1. d1 = d2,
30t = 55(t-0.45),
30t = 55t - 24.75,
55t - 30t = 24.75,
25t = 24.75,
t = 0.99s.

2. d = V*t = 30 * 0.99 = 29.7m.

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