I- a circus star of mass 75.0 kg is to launched from
groundlevel by a spring loaded device so that she clears a wall
3.00 mhigh and 4.00m away and lands onthe ground 5.00m behind
thewall.
what is the minimum impulse the spring must deliver to
achievethe desired trajectory?

The minimum impulse the spring must give the circus star in order to clear the wall height and land on the ground again is 287.25Ns. The spring needs to provide an impulse sufficient at leather get the circus performer to the highest point in flight after which she is now in free fall under the control of gravity.

Explanation:

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c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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