An amusement ride called the corkscrew takes the passengers through the upside-down curve of a horizontal cylindrical

Question:

An amusement ride called the “corkscrew” takes the passengers through the upside-down curve of a horizontal cylindrical helix. The velocity of the cars as they pass position A is 15 m/s, and the component of their acceleration measured along the tangent to the path is g cos θ at this point. The effective radius of the cylindrical helix is 5 m, and the helix angle is γ = 40°. Compute the magnitude of the acceleration of the passengers as they pass position A.