Q5. Suppose that v(t) represents the escape velocity in km/hour for a spacceraft orbiting a collapsing star as a function of the time measured in hours inside the spacccraft. Study the slope ficld of the differential cquation dv 1 dt 1+ sin(at)' Assuming that v(0) = }, after how much time it will become impossible for the spacccraft to escape the collapsing star? In other words, when is v(t) going to become infinitely large? (1) After 30 minutes. (2) After one hour. (3) After one hour and a half. (4) After two hours. (5) Cannot be determined

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