Tutorial 10 issue

[NickEfthymiou]

In the Jupyter workbook, the definition

def F(v, alpha, x2):
    "Forward physics model"
    return -(g/2)*((x2 / v * alpha.cos())**2) + (x2*(alpha.sin()/alpha.cos()))

is wrong. It should be (parentheses around v*cos(α) added):

def F(v, alpha, x2) -> Value:
    """
    Forward physics model
    """
    return -(g/2)*((x2 / (v * alpha.cos()))**2) + (x2*(alpha.sin()/alpha.cos()))

As is, the solver finds physically impossible solutions to the trajectory problem. The minimum required velocity to get to y2 is about 4.342 m/s.