Rocket activity continued 

Click
for definition of terms Maximum height of rocket
= H + h Hide the terms 

• Estimate the average acceleration between A and B Hint 

• Estimate the speed at B 

• Estimate x_{AB}
Hint 

B.
Calculating an Estimate of x_{BC}


• If air resistance is (temporarily)
ignored what is the net force on the rocket as it moves from B to C? Hint 

Hide
hint Average speed X time = distance Average speed is calculated using the expression below • What is the acceleration of the rocket as it moves
from B to C?
Hide the hint 

• Use the estimate of v_{B} obtained earlier to calculate
a value of x_{BC}. Hint
Hide the hint Note that for the motion from A to B speed increases from 0 to v_{B} , while for the motion from B to C the speed changes from v_{B} to 0 

• Add x_{AB} and x_{BC} to obtain a value for the height reached by the rocket.  
• Use your measurements of D, X1, X2 to determine a
value for H. 

Estimate h. How does your value for H + h compare with your value for
x_{AB} + x_{BC} ? Why do you think they are different? 

Click to hide hint
Force is calculated by the expression below.
Force = mass X acceleration.
Where mass is in kilograms and acceleration is in m/s.
Hence
acceleration = force / mass