Astudent runs 100 meters in 11 seconds. what is the speed of the student? use the following formulas: speed = distance/time; 1 mile = 1609 metersa.) 9.1 miles per hour
b.) 16 miles per hour
c.) 20.3 miles per hour
d.) 24 miles per hour

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?