## Should velocity always be in m.s. when solving? [ENDORSED]

$\lambda=\frac{h}{p}$

Jennifer1E
Posts: 25
Joined: Fri Jun 23, 2017 11:39 am

### Should velocity always be in m.s. when solving?

When solving for the DeBroglie wavelength, should the velocity always be in m.s? I was working on a problem where the velocity was given in km hr and I was not sure if I needed to convert it into m.s.

Davalanya 1F
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Joined: Fri Jun 23, 2017 11:39 am
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### Re: Should velocity always be in m.s. when solving?

In past problems, I want to say that you have to change the units because it is commonly in m*s.

Aliza Ajmal 1D
Posts: 25
Joined: Fri Sep 29, 2017 7:05 am

### Re: Should velocity always be in m.s. when solving?  [ENDORSED]

The SI units (standard units) are meters per second (m/s). If you're confused on what units to use, just use m/s because it will most likely be correct. However, if the problem specifies the units, then make sure to stick with those. I hope this helps!

Andrea ORiordan 1L
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### Re: Should velocity always be in m.s. when solving?

To have your units correctly cancel, stick with the metric system's SI units while solving the equation. If the answer asks for velocity- say, in mph- you should complete the problem using the metric system & SI units, and then convert your answer to the desired units using dimensional analysis.

Phillip Tran
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

### Re: Should velocity always be in m.s. when solving?

I would play it safe and use m.s

Posts: 54
Joined: Thu Jul 27, 2017 3:00 am
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### Re: Should velocity always be in m.s. when solving?

Yeah, velocity should be in meters per second.

Posts: 54
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### Re: Should velocity always be in m.s. when solving?

Yeah, velocity should be in meters per second.

Leanne Wong 1H
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### Re: Should velocity always be in m.s. when solving?

Yes, velocity should be in meters per second.

Lianna Kishi 1A
Posts: 23
Joined: Thu Jul 27, 2017 3:00 am

### Re: Should velocity always be in m.s. when solving?

To be safe I would put velocity in m/s. However, my TA did an example in discussion where he left velocity in km/s and mass in g and the answer still turned out correct because the units correctly canceled with one another.

Tasnia Haider 1E
Posts: 55
Joined: Sat Jul 22, 2017 3:01 am

### Re: Should velocity always be in m.s. when solving?

Velocity should be in its SI units unless state otherwise on a test.

Tylor McGrew 1J
Posts: 20
Joined: Fri Sep 29, 2017 7:03 am

### Re: Should velocity always be in m.s. when solving?

Velocity itself is measure in meters per second. Therefore, one should typically convert all values of velocity to meters per second to solve an equation.

Shreya Ramineni 2L
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: Should velocity always be in m.s. when solving?

Velocity should always be in m/s with chemistry calculations.