Simple? Motion Equation Problems

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Homework Help Overview

The discussion revolves around motion equations in kinematics, specifically focusing on problems involving uniform acceleration. The original poster presents two scenarios: one involving a soccer player accelerating down the field and another involving a skier descending a hill.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the applicability of the equations of motion, questioning whether the provided equation for final velocity is suitable given the information available. There is an exploration of isolating variables and the need for additional equations to solve the problems.

Discussion Status

The discussion is active, with participants examining the relevance of the equations presented. Some guidance has been offered regarding the necessity of finding appropriate equations based on the given information, and there is a recognition of the need for further clarification on the variables involved.

Contextual Notes

Participants note that certain key variables, such as final velocity and acceleration, are not provided in the problems, which complicates the attempts to apply the equations of motion directly.

harujina
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Homework Statement



1. A soccer player with an initial velocity of 0 (rest position) accelerates uniformly as she runs down the field traveling 17m [E] in 3.8s. What is her final velocity?

2. A skier sits at rest on top of a hill. If the skier travels 70m [down] in 5.3s while accelerating uniformly, what acceleration does he experience?

Homework Equations



a = (vf-vi)/t ?

The Attempt at a Solution



So I used the above equation to try and solve these but they're not working?
The answer to 1 is supposed to be 8.9m/s[E] and the answer to 2 is 5.0m/s2 [down].
 
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You are not given the final velocity in this problem. Obviously, the equation you listed as relevant is not applicable. You need another equation. Examine carefully what is given in the problem and find an appropriate equation.
 
yes, but if i isolate vf and i get vf = vi +at, shouldn't that be ok to use?
 
Acceleration is not given either.
 
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oh; d= (vf+vi)/2t
okay i got it, thank you :)
 

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