Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Finding acceleration and weight

  1. Sep 27, 2007 #1


    User Avatar

    1. The problem statement, all variables and given/known data

    On some strange planet you find that a 9.2 kg object falls downward 27.4 meters in 6.2 seconds. What is the magnitude of the accleration due to gravity on this planet? How much does the object weigh on this planet? How much would it weigh back on earth?

    2. Relevant equations

    xf = xi +vit +1/2at^2
    w= mg

    3. The attempt at a solution

    a. 27.4 m/ 6.2 s = 4.42 m/s

    27.4 = 0 + 4.42 + 1/2 a 6.2^2

    27.4 = 4.42 + 19.22a

    a= 1.195 m/s^2

    b. 1.195(9.2)

    10.99 mg(?)

    c. (1.195) (9.8 m/s)

    = 11.62 mg(?)

    I thought the units would be in mg for the weight, but it said my units were inapproriate as well.
  2. jcsd
  3. Sep 27, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Acceleration has units of [tex] \frac{distance}{time^2}[/tex]

    At sea level on earth, the gravitational acceleration is about 9.81 m/s2.

    would give the average velocity, not initial velocity.

    Try y = 1/2 a t2

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook