The discussion revolves around a physics problem involving projectile motion, specifically analyzing the time of flight for a body thrown at an angle to the horizontal. Participants are examining the relationship between vertical components of velocity and gravitational acceleration.
The discussion is active, with participants providing insights and raising questions about the assumptions made in the problem. There is a focus on clarifying the definitions of variables and the conditions under which the provided answer holds true. Multiple interpretations of the problem are being explored, particularly concerning the treatment of velocity components.
Participants note that the original question lacks sufficient information regarding the velocities at points A and B, which complicates the analysis. There is also a discussion about the potential for misleading interpretations based on the problem's phrasing.
The question is complete, I believe the author wanted to make this question a little bit more harder and trick into thinking there is a numerical answer since there was a second right answer with data which weren't mentioned in the problem.haruspex said:
Can I chip in? Maybe the problem is this: vay, vby and g are vectors. If you substitute actual values, the values for vby and for g will be negative (assuming upwards is positive). Try this:rbh said:
It is nonsensical to leave the solver to choose which variables are to be taken as given, whether as numbers or variable names. Instead of assuming the vertical velocities at A and B are known, you could assume the time is known, then just answer "t".rbh said:
Having specified y components, I see no advantage in taking them as vectors. Perhaps you meant that vA and vB are vectors, so ##\vec v_B-\vec v_A## would be a vertical vector? But that still doesn't let us divide by vector ##\vec g##.Steve4Physics said:
