please help me
A person launches a home-built model rocket straight upinto the air at y = 0 from rest at time t = 0 . (The positive y-direction is upwards). The fuel burns out at t = t0. The position of the rocket is given by
with a0 and g are positive. Find the y-components of the velocity and acceleration of the rocket as a function of time. Graph ay vs t for 0 < t < t0.

-- We know that the y-component of acceleration is the derivative of the y-component of velocity.-- We know that the y-component of velocity is the derivative of the y-component of position.-- We're given the y-component of position as a function of time.So, finding the velocity and acceleration is simply a matter of differentiating the position function ... twice.Now, the position function may look big and ugly in the picture.  But with theexception of  't' , everything else in the formula is constants, so we don't even need any fancy processes of differentiation.  The toughest part of this is going to be trying to write it out, given the text-formatting capabilities of the wonderful envelope-pushing website we're working on here.From the picture . . . . . y (t) = (1/2) (a₀ - g) t² - (a₀ / 30t₀⁴ ) t⁶First derivative . . . y' (t) = (a₀ - g) t  -  6 (a₀ / 30t₀⁴ ) t⁵  =  (a₀ - g) t  -  (a₀ / 5t₀⁴ ) t⁵There's your velocity . . . /\ .Second derivative . . . y'' (t) = (a₀ - g) -  5 (a₀ / 5t₀⁴ ) t⁴ = (a₀ - g) -  (a₀ /t₀⁴ ) t⁴and there's your acceleration . . . /\ .That's the one you're supposed to graph.a₀ is the acceleration due to the model rocket engine thrust      combined with the mass of the model rocket'g' is the acceleration of gravity ... 9.8 m/s² or 32.2 ft/sec²t₀  is how long the model rocket engine burnsPick, or look up, some reasonable figures for a₀ and t₀ and you're in business. The big name in model rocketry is Estes.  Their website will give youall the real numbers for thrust and burn-time of their engines, if youwant to follow it that far.