Check My Answers for Velocity Questions | Helpful Advice to Ensure Accuracy

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The discussion revolves around a request for assistance in verifying answers to velocity-related questions. Participants emphasize the importance of checking signs in calculations, noting that sign errors can lead to incorrect conclusions even if the final numerical answers appear correct. One user acknowledges previous feedback and admits to missing a sign in their calculations. The conversation highlights the necessity of careful attention to detail in physics problems. Overall, the exchange serves as a reminder of the critical nature of accuracy in problem-solving.
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yes i did read your comments, and i did implement the corrections (except i missed out the (-) for vAx = 80)

i do apologize for making multiple threads, i just thought i'd post both questions together, as i wanted a check for one of my other questions...
 
For your second problem, you have the correct answer but again you need to pay closer attention to your signs.
 
ahh, i see what i did wrong. since vBx will be traveling in a negative direction, although it gives the same answer, my workings were wrong, which in this case are important. thank you
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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