$E=hv$

JennyCKim1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

For the equation Ek = (1/2)m*v^2, does ^2 apply to the whole equation ((1/2)m*v)^2 or just v (v^2)?

Rita Dang 3D
Posts: 31
Joined: Fri Sep 29, 2017 7:07 am

^2 only applies to v, not the whole equation.

Ava Harvey 2B
Posts: 54
Joined: Fri Sep 29, 2017 7:04 am

For the equation Ek = (1/2)m*v^2, the ^2 only applies to v (v^2). If we take a look at the units this make sense. Kinetic energy is given in the units of Joules (J), which translates to kg*m^2*s^-2. Thus, when looking at the units of the equation (1/2)m*v^2 we get kg*m^2*s^-2. If we were to square the entire thing we would get kg^2*m^2*s^-2, which are not the correct units. Hope this helps!

Karan Singh Lecture 3
Posts: 23
Joined: Fri Sep 29, 2017 7:07 am