PreAP Physics

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Pam has a mass of 40Kg and she is at rest on smooth, level, frictionless ice. Pam Straps on a rocket pack. The rocket supplies a constant force for 22m and Pam acquires a speed of 62 m/s.
A) What is the magnitude of the force?

B) What is Pam's final Kinetic Energy?

  • PreAP Physics -

    First compute the time t that the force acts.
    Vaverage*t = Vfinal*t/2
    = (31 m/s)*t = 22 m
    t = 0.7097 s
    a = Vfinal/t = 62/0.7097 = 87.4 m/s^2
    F = M a = ?
    Final KE = (1/2) M Vfinal^2
    (That part ie easy!)

  • PreAP Physics -

    To: DRWLS,
    I got 3500 Newtons for part A? What am I doing wrong?

  • PreAP Physics -

    I get about the same answer for Part A.

  • PreAP Physics -

    I did not use time in my equation. I used Force * Distance= change KE for Part A and got the 3500 Newtons.

    What am I doing wrong?

  • PreAP Physics -

    There is nothing wrong with your answer or method that I can see. I got the same answer (to three significant fgures) with a different method.

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