- #1
kaylamalanie
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Homework Statement
A car moving at a velocity of 20 m/s is behind a truck moving at a constant velocity of 18 m/s. When the car is 50 m behind the front of the truck, the car accelerates uniformly at 1.8 m/s^2. The car continues at the same acceleration until it reaches a velocity of 25 m/s, which is the legal speed limit. The car then continues at a constant velocity of 25 m/s, until it passes the front of the truck. Find the time interval from the point that the car reaches the speed limit until it passes the truck.
Homework Equations
v=v0+at^2 is what I used, but now I'm unsure.
The Attempt at a Solution
I'm doing test corrections on a test. I know that the answer is approx. 5.2 s, but I'm really stuck at getting to it. Using the above equation, I got 1.97 s, but the answer isn't right or reasonable. I'm really stuck.
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