I have been stumbling through a physicproblem and was wondering if someone could

Question

I have been stumbling through a physicproblem and was wondering if someone could helpme.  

The physic problem states the a rocket is fired vertically upwardwith an intial velocity of 80m/s. It accelerates upward at4m/s squared until it reaches an altitude of 1000m. At thatpoint, its engines fail and the rocket goes into free-fall, withacceleration of -9.8m/s squared. How long is the rocket abovethe ground, What is its maximum altitude and What is it velocityjust before it collides with the earth? IF ANYONE COULD HELP I WLL RATELIFESAVER!!!!!!!!!!!!!!!!!!! I have been stumbling through a physicproblem and was wondering if someone could helpme.  

The physic problem states the a rocket is fired vertically upwardwith an intial velocity of 80m/s. It accelerates upward at4m/s squared until it reaches an altitude of 1000m. At thatpoint, its engines fail and the rocket goes into free-fall, withacceleration of -9.8m/s squared. How long is the rocket abovethe ground, What is its maximum altitude and What is it velocityjust before it collides with the earth? IF ANYONE COULD HELP I WLL RATELIFESAVER!!!!!!!!!!!!!!!!!!! IF ANYONE COULD HELP I WLL RATELIFESAVER!!!!!!!!!!!!!!!!!!!

Explanation / Answer

v = 80 m/s. a = 4 m/s2, h = 1000 m. g= -9.8 m/s2 find time t and final velocity V use h = vt1 + at12 to findt1 final velocity just before engine fails = v' v' = v + at1 use -h = v't2 - gt22/2 to findt2 t = t1 +t2 V = v' - gt2

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