Physics
shawnnn
22

The brakes of an automobile are suddenly applied at the instant when its velocity is 20 m/s. If the automobile comes to a stop after 5 seconds, what is its acceleration?

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Travelstead238

Data: Time (t) = 5 seconds Final Velocity (v) = 0 [as the car comes to rest] Initial velocity (u) = 20 m/s Acceleration = ? (Negative because it is braking) [latex]Acceleration = \frac{v-u}{t} [/latex] [latex]Acceleration = \frac{0-20}{5} [/latex] [latex]\boxed{Acceleration = - 4m/s^2}[/latex]

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