Physics Problem

[Riddleman]

I know this isn't the Physics forum but can someone please verify if i did this problem correctly, thx. Text

 

[radioouman]

Sort of round about way to solve part b (by including cos), but it seems to be right. (although I didn't check your math)

 

[Triumph]

yes it's correct. the signs are what usually trip people up, though. as long as you set up your sign convention at the beginning of the problem and remain consistent, you'll be good. some books like to start out saying something like, "Work done by an object is positive and work done on an object is negative." The opposite is also true, it only matters that you are consistent and understand which convention you choose.

 

[Riddleman]

THanks alot guys. Viva la internet.

 

[Legendary]

Your label for (a) is incorrect. Work is not measured in N but J or Nm (basically you forgot the m)

 

[LordMorpheus]

Its right, but you really shouldn't need our help to solve that problem (or, rather, or confirmation).

 

[Atomicus]

isn't g suppose to be -9.81?

 

[archcommus]

Problem's right but your handwriting sucks ass.

 

[HonkeyDonk]

Originally posted by: Legendary
Your label for (a) is incorrect. Work is not measured in N but J or Nm (basically you forgot the m)

yup. correct.

I think the OP forgot to put s^2 for the gravitational acceleration.

should be 9.8m/s^2