A car engine produces a constant power of P = 340 hp. The car and motor have a combined mass of m = 2070 kg. a. The car starts from rest, and after t = 5 s what is the car's speed, in meters per second? You may assume no energy is required to spin the tires. b. Assume a top fuel dragster of mass m = 1000 kg can accelerate and cover 420 m in 7.5 seconds from a dead stop. How much horsepower is the engine producing, assuming the acceleration is constant?

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.