As shown in Fig. 3, a particle of mass m slides under the action of gravity inside a frictionless tube which
is bent in the shape of a helix of radius r and helix angle a. The acceleration along the tangent to the
path is gsin@. The particle starts from rest at time t= 0 sec from the initial position (z=a,8 - 0).
a) Define your coordinate system clearly and find the acceleration vector à
b) Find the velocity vector V
c) Find the position vector 7
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