Calculating Distance from Constant Force: A Kinematics Problem

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Homework Help Overview

The discussion revolves around a kinematics problem involving a block of ice being pushed by a constant force on a frictionless surface. The original poster is attempting to calculate the distance the block moves after the force is no longer applied, given its initial conditions and the time intervals involved.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to apply kinematic equations to determine the distance traveled by the block after the force is removed. Some participants question the calculations and suggest ensuring the correct velocity is used at the end of the initial time interval.

Discussion Status

The discussion includes attempts to clarify the calculations involved in determining the block's velocity at the end of the initial time period. Some guidance has been offered regarding the need to find the correct velocity before proceeding with further calculations.

Contextual Notes

There is mention of potential confusion due to the problem's source, indicating that the original poster may be facing issues with the problem setup or the platform used for the assignment.

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Homework Statement


A dockworker applies a constant horizontal force of 72.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 10.0m in a time 4.50s. If the worker stops pushing at the end of 4.50 , how far does the block move in the next 5.70s?


Homework Equations


v = at
x = x0 + v0t + 1/2at^2


The Attempt at a Solution


I realized this is only a kinematics problem, but I keep getting the wrong answer. I got 32.1m, but the answer is 25.3m. I did v=at, plugging in 0.987654321*5.70 then multiplied this answer by 5.70. What am I doing wrong??
 
Physics news on Phys.org
Nothing. Unless you made a mistake in typing the question out, your answer is correct.
 
Weird. I copied & pasted the exact question from the website. Stupid MasteringPhysics -____-
 
I did v=at, plugging in 0.987654321*5.70
You have to find the velocity at the end of 4.5s.
 
Oops, I somehow missed that too. Sorry magnifik!
 

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