How do you determine work done wi th just mass and distance?

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1. Mar 20, 2015

crushedcorn

1. The problem statement, all variables and given/Information

If a person pushes a 28 kg object 1.2 m, how much work did they just do?
2. Relevant equations
W=Fd
F=ma

3. The attempt at a solution
If W=Fd and F=ma, then W=(ma)d. The farthest I can get is W=28a*1.2=33.6a. Since the motion is horizontal, a=9.8 m/s2 wouldn't apply, so I am left with 2 variables and no answer. However, the correct answer is 1200 J. Where is this answer coming from?

2. Mar 20, 2015

BvU

Out of the blue, as they say. Hello CC, and welcome to PF !

With the given information, there really is no telling. As you more or less conclude correctly.
There must be something else.

3. Mar 20, 2015

Suraj M

you would need atleast $a$ or final velocity. because for 1200J a= 35.7m/s², what if i choose a=1m/s². ill get a different answer.
So the question is incomplete.

4. Mar 20, 2015

crushedcorn

Thank you and thank you! I felt like I was missing the entire concept. I feel much better :-)