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July 4, 2015

Homework Help: Physics

Posted by Bob on Sunday, October 3, 2010 at 3:57pm.

To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.0 km/h, and 24.4 m when the initial speed is 47.8 km/h.

(a) What is your reaction time?

(b) What is the magnitude of the deceleration?

I tried eliminating the values in order to find accel and time, but the values canceled out and when I tried separating them, I got the answer wrong. What am I doing wrong?

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