Car of mass m travelling down a motorway

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The discussion focuses on a car of mass m that decelerates from 100 km/hr to 60 km/hr over ten seconds after stopping acceleration. Participants are tasked with calculating the average force acting on the car during this deceleration. Additionally, they explore the power required to maintain a speed of 100 km/hr against this force and the energy difference when traveling at 105 km/hr compared to 100 km/hr. The conversation emphasizes the importance of showing calculations for clarity and collaboration in finding solutions. Overall, the thread aims to deepen understanding of physics concepts related to motion and energy consumption in vehicles.
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2. A car of mass m traveling down the motorway at 100 km/hr suddenly stops pressing the accelerator pedal. The result is that the car slows to 60 km/hr in ten seconds. Suppose all travel is along a level road.
(a) What is the average force acting on the car serving to slow it's motion?
(b) How much power is required to maintain the car at 100 km/hr given this external force?
(c) How much more energy is done in traveling at 105 km/hr than 100 km/hr? To how much petrol might this correspond?
 
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