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A car is traveling at 20(m)/(s) towards a stop sign and begins to brake when it is 30m from the sign. With what acceleration must

A car is traveling at 20(m)/(s) towards a stop sign and begins to brake when it is 30m from the sign. With what acceleration must the car brake in order to stop exactly at the sign (this is the minimum braking that must be applied to stop before going past the sign )?

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