# Answer on Mechanics | Relativity Question for teresa green

Question #9866

a car changes its speed from 60 m/s to 40 m/s it does this at a rat of four seconds what was the acceleration of the car

Expert's answer

V0 = 60 m/s

V1 = 40 m/s

dt = 4 s

a = dV / dt = (V1 - V0) / dt = (40 -

60) / 4 = -5 m / s^2

V1 = 40 m/s

dt = 4 s

a = dV / dt = (V1 - V0) / dt = (40 -

60) / 4 = -5 m / s^2

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