Answer:
option B
Explanation:
given,
seed of airplane = 70 m/s
height = 300 m
we know,
[tex]s = ut + \dfrac{1}{2}at^2[/tex]
[tex]300 = 0 + \dfrac{1}{2} \times 9.81\times t^2[/tex]
t = 7.82 s                 Â
now, the range of the crate
 R = V × t
   = 70 × 7.82           Â
   = 547.44 ≅ 548 m             Â
hence, the correct answer is option B