You are listening to a command center before the liftoff of a rocket. You hear the following: "T minus 10 seconds... go for

main engine start... T minus 9...8...7...6...5...4...3...2...1... we have liftoff."

Rocket clears

launchpad tower

6 seconds after liftoff

Launch

verification

16 seconds before

liftoff

Main engine start

3 seconds before

liftoff

Rocket topping

sequence complete

Launch control

system enabled

Boosters ignite

110 seconds before

liftoff

90 seconds before

liftoff

Liftoff

Name an event that could occur at -150 seconds. Describe when the event occurs in the order of events shown.

B

U

T² T₂

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