Vector Kinematics: Calculating Velocity & Position

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Homework Help Overview

The discussion revolves around a vector kinematics problem involving a particle's motion, specifically focusing on calculating its velocity and position given initial conditions and acceleration. The original poster expresses confusion regarding the problem setup and the necessary calculations.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants explore the implications of the given acceleration and initial velocity, questioning the clarity of the problem. There are attempts to clarify the components of velocity and position vectors, as well as the conditions under which the maximum x coordinate is reached.

Discussion Status

The discussion is ongoing, with participants seeking to clarify the problem's parameters and expressing uncertainty about the information provided. Some guidance has been offered regarding the need for known variables to solve the equations, but no consensus has been reached on the specifics of the problem.

Contextual Notes

There are indications that the problem may lack sufficient information, particularly concerning vertical height and velocity components, which are under discussion.

tdcamp
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A particle starts from the origin at t = 0 with an initial velocity of 5.0 m/s along the positive x axis. If the acceleration is (-4.9 + 2.9 ) m/s2, determine the velocity and position of the particle at the moment it reaches its maximum x coordinate.



velocity i m/s + j m/s
position i m + j m

i am completely lost on this.
 
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When the height of release of a projectile equals the height of landing, the optimum angle is 45 degrees. The optimum angle basically is the angle at which you launch a projectile to cover the greatest horizontal distance. The velocity, V, in its components is Vx = Vcos45deg and Vy = Vsin45deg, in this case. Also i means horizontal and j means vertical.
 
thanks for the help but that's not it. the I hat for V in the answer is 0. i can't determine the J hat or position vectors however.
 
Sorry your question is a little unclear. Is the acceleration in i and j? Is the vertical height unknown? Is the vertical velocity unknown or just not mentioned?
 
That's what I was thinking too. It seams as if there is not enough information present to solve the equation.
 
It seems so but in case I'm wrong, in the future: you need either 3 known variables for one component or two known variables per two components then combine the equations.
 

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