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### Calculating Velocity

Posted: Sun Dec 09, 2018 2:24 pm
This is the equation you would use for this correct? because p= mv?

### Re: Calculating Velocity

Posted: Sun Dec 09, 2018 3:27 pm
yes and you could also use ke=1/2mv^2

### Re: Calculating Velocity

Posted: Sun Dec 09, 2018 3:56 pm
yes, the two equations involving velocity are p=mv and KE= 1/2mv^2

### Re: Calculating Velocity

Posted: Sun Dec 09, 2018 5:37 pm
Make sure you know the Difference!!!
p=mv is for the velocity of a photon, he will usually give you the momentum.

Ke is for Electrons!

### Re: Calculating Velocity

Posted: Sun Dec 09, 2018 5:53 pm
What is the units for momentum, p?

### Re: Calculating Velocity

Posted: Sun Dec 09, 2018 5:54 pm
Lynsea_Southwick_3F wrote:What is the units for momentum, p?
If the mass is in kilograms and the velocity is in meters per second then the momentum is in kilogram meters per second (kg⋅m/s)

### Re: Calculating Velocity

Posted: Tue Jul 02, 2019 11:27 am
Most of the time we use 1/2mv^2 to calculate velocity.

### Re: Calculating Velocity

Posted: Tue Jul 02, 2019 12:52 pm
It depends on different condition, like if you need to calculate the velocity, and you have time and distance, you can use the most common equation:v=s/t, and if you have the momentum and mass of a subject, and you need to calculate the velocity, you can use the equation you have mentioned.

### Re: Calculating Velocity

Posted: Wed Jul 03, 2019 11:07 am
Depends on the know information you have. If you know the kinetic energy of an electron then you could use 1/2mv^2 or if you know the momentum of the electron then you could use p=mv. Also the units for momentum would be kg.m.s^-1.

### Re: Calculating Velocity

Posted: Sun Jul 07, 2019 10:54 pm
electrons use ke, photons use the momentum equation