science(1answer)

4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast?




A.the train has less kinectic energy than the car.

B.the train has more kinectic energy than the car.(I PICK THIS)

C.the train has the same kinectic energy as the car.

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asked by annabelle

  1. Now really, I have replied three times now. Yes
    http://www.jiskha.com/display.cgi?id=1391014223

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    posted by Damon

  2. Oh sorry, slightly different, train going v
    for train
    (1/2) m v^2 = 5,000 * 10^2

    for car

    (1/2) m v^2 = 1300 * 4 * 10^2
    = 5,200 * 10^2

    so now it is the car number A

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    posted by Damon

  3. The answer to the test is:
    1.C
    2.B
    3.C
    4.A
    I have done this test. These answers are correct.

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    posted by Lord

  4. You are welcome.

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    posted by Lord

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