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Asked Jan 22, 2003, 08:28 PM — 1 Answer
A car is travelling at 30 mi/hr when a traffic light 295 ft ahead turn yellow . The light wiil remain yellow for 5 seconds before turning red.
A) What constant acceleration will cause the car to reach the light at the instant it turns red, and what will the velocity of the car be when it reaches the light.
B)if the driver decides not to try to make the light, what constant rate of deceleration wiill cause the car to come to a stop just as it reaches the light?

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flar30 Posts: 4, Reputation: 1
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May 4, 2004, 02:16 PM
Re: physic
1) 295=30*5+.5*A*5[sup]2[/sup]
A=11.6 mi/h[sup]2[/sup]

V[sub]f[/sub]-30=11.6*5
V[sub]f[/sub]=88 mi/h

2) 0[sup]2[/sup]=30[sup]2[/sup]+2A*295
A=-1.525 mi/h[sup]2[/sup]
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