Posted by david on Thursday, October 25, 2007 at 8:49pm.
Since the speed is constant, the acceleration must be caused by the change in direction. The angle of the trajectory to the x axis is
theta = arctan (dy/dx) = arctan (6x)
When x = 1.5, theta = arctan 9 = 83.66 degrees
The acceleration will be
(speed)x d(theta)/dt
= (speed)* d(theta)/dx* dx/dt
Take it from there.
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