OK, at my college we have to do our physics homework online. I hate this, because you submit answers to the system, and if you round wrong, or something, you have an incorrect answer.
Anyways, I was pissed at this problem, because I was 100% sure (as were my friends) of the correct answer:
The force on a 10 kg object increases uniformly from zero to 50N in 6.0s. What is the objects speed at the end of the 6.0 s interval?
That’s the question. I got 30 m/s, using the equation p=mv. Where p is momentum (in kg m/s), v is velocity, and m is mass. So I multiplied the force (50 N) by the time (6 s) because Newtons are kgm/s^2, so multiplying by seconds puts it into units of momentum. I then divided by 10 kg, and got 30 m/s. I got an inncorrect answer. I didn’t ask my professor because I missed the class, so I ask you.