Suppose that a country has no public debt in year 1 but experiences a budget deficit of $30 billion in year 2, a budget deficit of $30 billion in year 3, a budget surplus of $20 billion in year 4, and a budget deficit of $2 billion in year 5. a. What is the absolute size of its public debt in year 5

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?