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**Instantaneous Acceleration Help PLEASE!!!~~~**

I have a hw problem on

__Instantaneous acceleration__:

**The engine of a model rocket accelerates the rocket vertically upward for 2seconds as follows:**At

*t=0, speed=0*; At

*t=1s, s=5m/s*; At

*t=2s, s=16m/s*.

a) find the average acceleration during the 2s interval and

b) find the instantaneous acceleration at t=1.5s

My work so far:

a) avg acceleration:

a=v/t , (16m/s -0m/s)/(2s-0s)

= (16m/s)/2s

a=8m/s^2 Is that right??

__b) I need help on this one:__

What is the easiest and simplest way to find the instantaneous accerlation? What is the simplest equation?What is the easiest and simplest way to find the instantaneous accerlation? What is the simplest equation?

**I found an equation on a site but I don't understand what the variables mean and what numbers I have to put in.**

Equation?: a= lim t->0 (delta)v/(delta)t

On site: http://rockpile.phys.virginia.edu/arch2.pdf#search="instantaneous acceleration"

**Don't understand what it means and what numbers I have to subsitute!!**

BTW THANKS A LOT!!! =D

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