A car comes to a stop in 6s from a velicity of 30m/s. what is its acceleration? At the same acceleration, how long would it take the car to come to a stop from a velocity of 40m/s?

1 answer

v = Vi + a t
0 = 30 + a (6)
a = -5 m/s^2

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v = Vi - 5 t
0 = 40 - 5 t
t = 8 seconds