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Because the initial direction of velocity is up ( we define as +) , the acceleration is -9.8(against gravity)
(1).... s(y)=u(y) + 1/2a(y)t^2 Right?
Where s is displacement.
Also
(2).... u(y)=usinx
from (2) u(y)=40sinx
since s is displacement then s = -30 [displacement from...