# Acceleration of gravity

1. Aug 19, 2010

### gragsur

1. The problem statement, all variables and given/known data
A model rocket leaves the ground , heading straight up at 49 m/s
a) what is its maximum altitude?
b) what are its speed and altitude at 1,4 & 7 seconds

2. Relevant equations
v=v0 + at
x= x0 + 1/2 (v0 + v) t
x= x0 + v0t + 1/2 at^2
v^2=v0^2 +2a (x-x0)

3. The attempt at a solution
Am able to work out maximum altitude no problem , for some reason cant get my head around b) ?

2. Aug 19, 2010

### rl.bhat

Use the formula
x = xo + vot - 1/2*g*t^2 and find x at given time t.
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