Question

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7) A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 155 m above ground a package is dropped from a window. How much time is required for the package to hit the ground? A) 6.18 s B) 5.61 s C) 9.55 s D) 8.34 s E) 7.16 s F) None of these

Answer 1

Solution,

Using kinematic equation,

S = ut + 0.5 at^2

155 = (-5.2 t) + 0.5 x 9.8 x t^2

4.9t^2 - 5.2t - 155 = 0

Time, t = 6.18 sec (A)

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