physics
posted by help .
The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off.
What is the impulse exerted on the rocket?
What is the velocity of the rocket at the end of the 1.50 minute period?

physics 
bobpursley
impulsr=force*time=2E5*90 Nseconds
changevelocity=impulse/massrocket 
physics 
help
I don't understand where the 90 comes from
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