Use Force, Mass and Acceleration to find velocity

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Homework Help Overview

The problem involves a 2 kg block being pulled by a constant force on a frictionless surface, with the goal of finding its speed after moving a certain distance. The subject area pertains to dynamics, specifically the relationship between force, mass, acceleration, and velocity.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of Newton's second law (F=ma) and the kinematic equations to find the block's velocity. There are attempts to calculate acceleration and velocity based on the given force and distance.

Discussion Status

Some participants have offered feedback on calculations, suggesting that there may be errors in the transcription of values. The discussion is ongoing, with participants checking each other's work and exploring the implications of their calculations.

Contextual Notes

There appears to be a focus on ensuring the accuracy of calculations, with specific attention to the values used in the final velocity computation. The original poster is encouraged to clarify their work for better understanding.

trivk96
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Homework Statement


A 2 kg block initially at rest is pulled to the
right along a horizontal, frictionless surface
by a constant, horizontal force of 13.4 N.
Find the speed of the block after it has
moved 2.4 m.
Answer in units of m/s


Homework Equations


F=MA
V=Vo + at
X=1/2 at2


The Attempt at a Solution


13.4/2=6.7
time=.716417
velocity=4.79989
 
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Hi trivk96, Welcome to Physics Forums.

Your time and velocity don't look right. Can you post your work?
 
This is another try. Can you check if this is right


F=ma
13.4=2a
a=6.7

V=6.7t

x=1/2at2
2.4=.5(6.7)t2

t2=.7164
t=.84641

V=6.7(.85641)
V=5.570978
 
The method looks fine. I think you made a typo transcribing your time value into the final calculation, so the velocity is a bit off. Check it out.

Try using the x2 icon in the reply panel header to incorporate exponents in your posts.
 
Thank You
 

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