Homework Help: physics

Posted by help on Thursday, February 3, 2011 at 7:51pm.

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 N-seconds

changevelocity=impulse/massrocket
physics - help, Thursday, February 3, 2011 at 9:09pm
I don't understand where the 90 comes from

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