9. Lucas is in a car traveling at 15 m/s. This car starts to decelerate
steadily. It comes to a complete stop in 10 seconds. What is it's
acceleration?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

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?

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20