Wednesday, February 3, 2010

A motorist is traveling at 18 m/s when he sees a deer in the road 45 m ahead.?

A. If the maximum negative acceleration of


the vehicle is 鈭? m/s2, what is the maximum


reaction time t of the motorist that will


allow him to avoid hitting the deer?


Answer in units of s.


BIf his reaction time is 1.40318 s, how fast will


he be traveling when he reaches the deer?


Answer in units of m/s.A motorist is traveling at 18 m/s when he sees a deer in the road 45 m ahead.?
Please use the ^ (6+shift) for exponents.


鈭? m/s^2





The kinematic formula


Vf^2 = Vo^2 + 2*a*s


will give you the distance required to stop, once the brakes are applied. There were 45 meters. Assuming the kinematic formula gives you a stopping distance less than 45 m, the extra distance will be traveled at 18 m/s, during the driver's reaction time. Calculate the time it would take to travel the extra distance at the original speed.

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