A helicopter starts from rest at t = 0 from ground with a constant acceleration in vertically upward direction. At time t = 5 s, a ball is released from the helicopter which strikes the ground at t = 17.5 s. The acceleration of the helicopter is closest to 42/n m/s2 . Find n.
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thanks for free points
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height will be 15 m Thank you . I am actually not able to understand whats n
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