Today, WE SUBMIT REPORTS TO REMOVE KATIE & laurenercsp6fpli

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If you don't know who she is, she is a moderator who keeps deleting people's questions and answers that are valid, and give people a warning with it, it's time for her to go, we are tired of this, cant be better, if we don't stick together to remove her, then wrong people will not get banned.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?