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Thanks a lot!!! Anyone get any math method? for the first Question, the answer is 18 degrees!

QUIZ One A horizontal drainpipe 6m above sea level empties stormwater into the sea. If the water comes out horizontally an dreaches the sea 2m out from the pipe, find the initial velocity of the water, correct to 1 decimal place. Let g be 10 and neglect air resistance. Quiz Two A gun is aimed...