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The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hour (mph). At full power, the car can accelerate from zero to 28.0mph in time 1.10s . At full power, how long would it take for the car to accelerate from 0 to 56.0mph ? Neglect friction and air resistance. Express in seconds
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Added Fri, 03 Jul '15
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Under constant Force, you get constant acceleration.
The only formula you need is speed = accelration * time
The acceleration is 28 mph / 1.1 secs

Now 56 mph = (28mph / 1.1 secs) * time to accelerate to 56mph

so the time is 1.1 * 56 / 28 =2.2s
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Added Fri, 03 Jul '15
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