What impulse is needed to change the speed of a 16 kg object

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Homework Help Overview

The discussion revolves around calculating the impulse needed to change the speed of a 16 kg object from 14 m/s to 26 m/s over a period of 5 seconds. Participants are exploring the relationship between impulse, force, and speed in the context of physics.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to calculate impulse using the change in momentum and questioning the correctness of the provided answer. There are discussions about whether the direction of motion is relevant and if the initial and final speeds are accurately stated.

Discussion Status

The conversation is ongoing, with participants expressing confusion about the calculations and the validity of the given answer. Some are questioning the assumptions made regarding the direction of the object's motion and the specific speeds involved.

Contextual Notes

There is uncertainty regarding the initial and final speeds, as well as the interpretation of impulse as a vector quantity compared to speed as a scalar. Participants are also considering the implications of these factors on the calculations.

Dil
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This question is infuriating me. It says the answer is 32, but I can't get that.
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What impulse is needed to change the speed of a 16 kg object from 14 m/s to 26 m/s in a time of 5s? How much force is needed?

mVf - mVi
(16)(26)-(16)(14) = 192

F(change in 5s)=192 192/5 = 38.4N
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What am I doing wrong?
 
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Impulse is a vector quantity and speed a scalar. Is the direction changing pls see it
 
I don't think the direction is changing
 
Perhaps the given answer is wrong... It sure looks wrong to me!
 
Yes to me it 2 seems to be on wrong side
thats why i asked for direction
 
You sure it's not 16 to 26 m/s or 14 to 24 m/s?
 

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