•  A motorcyclist and motorcycle traveling with a combined mass of 250kg and moving with a speed of 45.0km/hr, sees the traffic light change in the distance, and begins to brake, bringing the vehicle safely to rest at the light. After the light turns green, the motorcyclist begins to accelerate, bringing the vehicle to 50.0 km/hr, after which the vehicle proceeds at a steady speed.
• a. What work is done on the motorcycle (and cyclist) by friction, in bringing the system to rest?
• b. What work is done on the motorcycle (and cyclist) by the engine, in bringing the system to a steady speed of 50.0 km/hr?

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First lets recall the definition of work In physics work is defined as the force exerted on an objec... View the full answer