You Are a Fireworks-Launcher,and Launch a Fireworks Shell into the Air

You are a fireworks-launcher,and launch a fireworks shell into the air directly above you with an initial speed of 227 m/s.If it explodes at the top of its trajectory,how long after launch do you hear the explosion? Assume 343 m/s for the speed of sound.

A) 23.1 s
B) 30.8 s
C) 38.6 s
D) 46.1 s
E) None are correct.

Correct Answer:

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