Recent content by pstrokeslibs

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    The skaters are pushing each other, find the ratio of their speed?

    Homework Statement Two skaters stand face to face. Skater 1 has a mass of 55 kg, and skater 2 has a mass of 75 kg. They push off one another and move in opposite directions. What is the ratio of skater 1's speed to skater 2's speed? Homework Equations KE=0.5*m*v^2 The Attempt at...
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    Find the average power of the crashed test car.

    i got it now! thanks very much! but... the 30.9 is final velocity...
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    Find the average power of the crashed test car.

    So we can use equation W=(delta)KE right? but what is the initial KE and final KE... I am sorry should the initial velocity be 30.9m/s and the final velocity 0m/s?? I am going to use W=1/2m(finalvelocity^2-initialvelocity^2) Thanks for help :D
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    Find the average power of the crashed test car.

    Homework Statement In a crash test, a test car of mass 1734 kg is moving at a speed of 30.9 m/s (= 69.5 miles per hour) when it crashes into a wall. If the car comes to rest in 0.8 s, how much average power (in W) is expended in this process? Homework Equations P=W/t to find "P" W=Fd...
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