Option B: acid+base->water+salt is the equation represents a neutralization reaction.
Answer
According the conservation of energy

I for ball = 




![v_i^2+[1+\dfrac{2}{3}]=2gh](https://tex.z-dn.net/?f=v_i%5E2%2B%5B1%2B%5Cdfrac%7B2%7D%7B3%7D%5D%3D2gh)



a) 


b) 


Answer:
The best single equation in order to fin the acceleration is

Explanation:
The best single equation in order to find the acceleration is the following kinematics equation:

As the rocket start from the rest, the initial velocity value is zero. Then the acceleration value is:

I think a reflected ray should be symmetrical so I believe your answer is 32 degrees