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Homework Help: Determine Mass from Net Force, distance, and velocity

  1. Apr 23, 2012 #1
    First time in these forums so nice to meet everyone

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

    A dynamics cart is pulled from rest by a net force of 1.2M [Forward]. The cart moves 6.6m, reaching a velocity of 3.2m/s [Forward].

    2. Relevant equations


    3. The attempt at a solution

    I tried using the formula V(final)^2 = V(initial)^2 + 2*a*d to get acceleration and plug it into F=ma to find mass and got 5kg but the textbook says that the answer is 1.5kg
  2. jcsd
  3. Apr 23, 2012 #2


    Staff: Mentor

    I assume vi = 0 in your calculation so that vf^2 = 2 . a . d with d=6.6m

    what did you get for a?

    given a you should get what your book says.
  4. Apr 23, 2012 #3
    Possibly you made an error in your calculations. As jedishrfu said, if you plug in all the known values in, you should get 1.5kg no problem.
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