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4. A Physics instructor, dissatisfied with his salary and looking for a thrill, performs motorcycle stunts in his spare time. His last stunt is to jump from a ramp angled 53.0° from horizontal over a 40.0 m river, and land on the other side at a point 15.0 m below the ramp.
(i) What is the minimum speed to just make it to the other side?
(ii) If his speed was (unfortunately) only half the value from part (a), where does the rider strike the other side of the cliff?
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