Comment answers below and will add.
Section A:
It tips
a=1/2
theta= pi/6, 5pi/6
Section B:
Speed increasing
n=16 where sum is a maximum
Height around 91m
Range around 700-800m
Newton Raphson - 1.269
Stretch 1/sqrt53 in y-direction and translate across -0.2 something in column vector
for i and j: k=-4 and new velocity is 4i+9j
Differential equation
K= 1.4
Coeff. Of friction = 0.506