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, Thursday, February 3, 2011 at 8:18pm
impulsr=force*time=2E5*90 Nseconds
changevelocity=impulse/massrocket
physics  help, Thursday, February 3, 2011 at 9:09pm
I don't understand where the 90 comes from

1.5 minutes is 90 seconds, last time I checked.
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