A parachutist bails out and freely falls 50 m. Then

A parachutist bails out and freely falls 50 m. Then

A parachutist bails out and freely falls 50 m. Then the parachute opens, and thereafter she decelerates at 2.0 m/s2. She reaches the ground with a speed of 3.0m/s.
(a) How long is the parachutist in the air?
(b) At what height does the fall begin?

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