Physics, 25.08.2019 13:30, Battboi

Acar travels a distance of 80 km. for the first 30 minutes it is driven at a constant speed of 80 km/hr. the motor begins to vibrate and the driver reduces the speed to 40 km/hr for the rest of the trip. the average speed for the entire trip is?

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Acar travels a distance of 80 km. for the first 30 minutes it is driven at a constant speed of 80 km...