Physics A123 Acceleration problem

Click For Summary

Homework Help Overview

The problem involves calculating the initial speed required for a person to jump to a height of 130 cm. The subject area is kinematics, specifically focusing on motion under constant acceleration due to gravity.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the appropriate equations to use, with some suggesting alternatives that involve fewer unknowns. There is also a consideration of the final velocity at the peak of the jump and the acceleration due to gravity.

Discussion Status

The discussion is active, with participants providing guidance on selecting equations and questioning the number of unknowns in the original equation. There is an exploration of different interpretations of the problem, particularly regarding the nature of the motion involved.

Contextual Notes

Participants note the constraints of the information provided and the challenges faced by a first-time physics student in understanding the concepts involved.

c_barrera2
Messages
3
Reaction score
0

Homework Statement

Excellant human jumpers can leap strait up to a height of 130cm off the ground. To reach this height, with what speed would a person need to leave the ground?



Homework Equations


I would just like to know what equation I would need to solve this,


The Attempt at a Solution


xf = xi +(vx) (delta)t + 1/2ax(deltat)^2
 
Physics news on Phys.org
Since the equation you list has 2 unknowns , vx and t (a is known), you can't solve it without another equation. Why not instead try another equation that has just one unknown, vx (the initial velocity)? You must first note what is the the final velocity at the top of the jump, and what is the acceleration?
 
you can use this eqn

v^2 - u^2 = 2as
 
Last edited:
hmmmm, yeah this is all the iformation its giving me, I'm trying to find the (Vx)f, the final velocity of this person. if I'm not mistaken this equation would look like a parabola, right?
 
ya see I'm a first time physics student you know...and generally I can teach myself a a subject, haha but physics it not just any other subject...its like the king of all science subjects
 
why 2 unknowns?
my eqn gives you the answer ... can't write the answer ... got warnings for writing answers ...

what do you think v(final) would be?
 

Similar threads

Replies
7
Views
3K
Replies
5
Views
9K
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
Replies
12
Views
2K
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K