List all values of a for which open curly brackets open parentheses a squared comma 0 comma 1 close parentheses comma open parentheses 0 comma a comma 2 close parentheses comma open parentheses 1 comma 0 comma 1 close parentheses close curly brackets is not a basis for R3. Give your answers in order from least to greatest. Separate with commas but no spaces.

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?