Change in Velocity


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MHarrold_1E
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Change in Velocity

Postby MHarrold_1E » Mon Oct 26, 2020 11:08 am

If the velocity of an object is 10 m/s (+/- 2), does that mean the change in velocity is 4?

Kiran Singh 3A
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Re: Change in Velocity

Postby Kiran Singh 3A » Mon Oct 26, 2020 11:11 am

I believe so. When the problem gives +/- a value, you simply double that value to get the uncertainty.

Kareena Patel 1G
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Re: Change in Velocity

Postby Kareena Patel 1G » Mon Oct 26, 2020 11:17 am

Exactly! So for that problem, you do 10+2 and 10-2 to get 12 and 8, respectively. Then, do final velocity (12) - initial velocity (4) = change in velocity (4).

Abby Lam 3F
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Re: Change in Velocity

Postby Abby Lam 3F » Mon Oct 26, 2020 11:27 am

Yes! The change in velocity is 4 because you multiply the +/- value by two.

Becca Nelson 3F
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Re: Change in Velocity

Postby Becca Nelson 3F » Mon Oct 26, 2020 11:53 am

Yes! Delta v is uncertainty in velocity. If your velocity is 10+/- 2 you could have a velocity of either 8 or 12, so there is a difference of 4. This is the value you will plug into the equation.

Nadya Higgins 3F
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Re: Change in Velocity

Postby Nadya Higgins 3F » Mon Oct 26, 2020 12:30 pm

yup, anytime a question asks for a change in velocity, you can disregard the actual velocity the object is traveling at. The important part is knowing the uncertainty or change with the plus/minus value. So if an object travels at 20 m/s plus/minus 3 m/s, then the change in velocity would be 6 m/s.


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