Solving for final velocity in physics formula
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Solving for final velocity in physics formula

[From: ] [author: ] [Date: 11-12-10] [Hit: ]
whats the example leading to the answer please! and thank you-velocity, u = 20 m/sacceleration, a = -7 m/s^2time = 0.final velocity, v = 20 +(-7)(0.......
A car is traveling 20 m/s when the driver sees a child standing in the road. He steps on the brakes and slows down at 7.0 m/s^2. His reaction takes 0.9 seconds. What is the final velocity of this car?

whats the example leading to the answer please! and thank you

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velocity, u = 20 m/s
acceleration, a = -7 m/s^2
time = 0.9 sec

final velocity, v = 20 +(-7)(0.9),

v = 20 - 6.3 = 13.7 m/s >===============< ANSWER

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use should use the formula v=u+at
v=(20)+(-7.0)(0.9)
v=13.7m/s^-1
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