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A driver sees a bear in his headlights. He is driving at 25m/s and decelerates at a...

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brandih | eNotes Employee

Posted October 7, 2013 at 2:58 AM via web

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A driver sees a bear in his headlights. He is driving at 25m/s and decelerates at a rate of 4.9m/s2.

After breaking for 25.0 m, what is the ranger's speed?

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted October 7, 2013 at 3:16 AM (Answer #1)

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We can use equations of motion here.

`v^2 = u^2+2aS`

The data we have is:

`u = 25m/s`

`a = -4.9m/s^2` since we have a deceleration

`S = 25m`

`v^2 = 25^2-2xx4.9xx25`

`v = 19.49m/s`

So the speed of ranger after traveling 25m breaking distance is 19.49m/s

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