# Solving projectile motion equations

Gold Member
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Staff Emeritus

Er... "s" is not an unknown. It is a unit for "seconds".

Zz.

Gold Member

Okay, but why is it in second degree? Why did they need to add ^2 into a unit?

Staff Emeritus

Okay, but why is it in second degree? Why did they need to add ^2 into a unit?

Er.. it seems that you appear to not know that units can be squared, or undergo the same operations as a variable.

An acceleration, for example, is $L/T^2$, where L is length, T is time. So since the time dimension is squared, the units is also squared. In SI units, it is $m/s^2$. If you don't like the square symbol, then write it as $m/ss$. There, no more squared.

Zz.

Mentor

If you don't like the square symbol, then write it as $m/ss$.

Or as (m/s)/s: (meters per second) per second.

Gold Member

Ah...a little deeper ponderage after your replies got me to see the logic :) mercy.