Let |r| = 17 at an angle of 40° and |s| = 14 at an angle of 160°. Which expression represents |r + s|? StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (40 degrees) EndRoot StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (60 degrees) EndRoot StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (10 degrees) EndRoot StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (120 degrees) EndRoot

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?