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|dw:1439930033889:dw|

no just velocity. that second one was an accident

remember that velocity = change in displacement / time

|dw:1439930256339:dw|

derivative of a function tells you the slope of that function wrt to time everywhere

yeah I just get confused with what comes after S(t)

okay i see

you know that gravity is 9.8m/s^2 right

yeah

if u look carefully this equation models that

if u differentiate twice
s'(t)=2*4.9*t
s''(t) = 2*4.9=9.8

accerlation is the 2nd derivative of s(t) function

the units also tell you for example
9.8 m/s^2 = 9.8 m/s /s
the units m/s /s

change in speed or velocity / second

just one thing i think is a bit akward here is that they didnt put a - sign infront of your equation

so i guess position velocity in your case really means downward towards earth

positive*

yeah I noticed that to but I figured it was a typo or something