Asonic boom is caused by
a sound-producing object moving toward an observer

a sound-producing object overtaking it’s own sound waves

a sound-producing object moving away from an observer

a sound-producing object traveling just slower than its own sound waves

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the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

the answer would be   dignified - apex

connect the batteries in series and hope