Alarge rocket has a mass of 2.00×10⁶ kg at takeoff, and its engines produce a thrust of 3.50×10⁷ n. find its initial acceleration if it takes off vertically. how long does it take to reach a velocity of 120 km/h straight up, assuming constant mass and thrust? in reality, the mass of a rocket decreases significantly as its fuel is consumed. describe qualitatively how this affects the acceleration and time for this motion.

17.5 m/s²

1.90476 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

Force

Initial acceleration of the rocket is 17.5 m/s²

Time taken by the rocket to reach 120 km/h is 1.90476 seconds

Change in the velocity of a rocket is given by the Tsiolkovsky rocket equation

where,

= Initial mass of rocket with fuel

= Final mass of rocket without fuel

= Exhaust gas velocity

Hence, the change in velocity increases as the mass decreases which changes the acceleration

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

i think the answer would be reserve.