Question: 4. Ralph Wiggum is strolling through Springfield along the path r(t) = 4. Ralph Wiggum is strolling through Springfield along the path 9 cos(t), 9

4. Ralph Wiggum is strolling through Springfield along the path 9 cos(t),

4. Ralph Wiggum is strolling through Springfield along the path r(t) =

4. Ralph Wiggum is strolling through Springfield along the path 9 cos(t), 9 sin(t), sin(t + 7/4)) , r(t) position in feet. where t is time in minutes and r i (a) Determine Ralph's acceleration as function of time. (10 pts) (b) In what direction is Ralph heading when t = r? Express your answer vector. (10 pts)

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