Max Height & Initial Speed Calculation | Bottle Rocket Lab Help

[heatpro]

Homework Statement

Calculate the maximum height and the initial speed of the rocket. Show The equaltions and then show your substitutions. The total flight time was 6.52 seconds. the height time will be expressed in meters and feet and the velocity will be expressed at m/s, feet/second, miles/hour, km/hour.

Homework Equations

d=1/2gt^2 - only when initial velocity is 0 and object is at free fall. So i would have to use
a=change in velocity/time
a=gravity
g = -v -(+v)/t ====> v = gt/-2

The Attempt at a Solution

d= h = 1/2(9.80m/s^2)(3.26s^2) = 52.1m - 3 sig figs when multiplying correct?

v= (-9.80m/s^2)(6.52s)/-2

v= 31.9m/s => again not sure on the significant figs part.

please tell me if i am doing this correctly. thank you very much

 

[heatpro]

bump its due tomorrow