Amodel rocket climbs 200 m in 4 seconds. if was moving 10 m/s to begin with what is its final velocity

90 m/s

Explanation:

For this situation we will use the following equations:

(1)  

(2)  

Where:  

is the height of the model rocket at 4 s

is the initial velocity of the model rocket

is the velocity of the rocket at 4 s

is the time it takes to the model rocket to reach 200 m

is the constant acceleration due gravity and the rocket's thrust

Firstly, from equation (1) we have to find :

(3)  

(4)  

Now we have to substitute this value of in (2):

(5)  

Finally:

This is the rocket's final velocity

cant without the picture! ?

the answer is 12 as i may remember

: )