Apollo 11 had a mass of 28,801 kg at liftoff. Assuming that fuel was expelled at a constant rateof 3200 kg/s at an expulsion velocity of 1000 m/s, how much time was required for it to leavethe stratosphere (altitude = 50 km)? You may assume the mass remains constant and neglectaltitude-dependence of the gravitational force.

Apollo 11 had a mass of 28,801 kg at liftoff. Assuming that fuel was expelled at a constant rateof 3200 kg/s at an expulsion velocity of 1000 m/s, how much time was required for it to leavethe stratosphere (altitude = 50 km)? You may assume the mass remains constant and neglectaltitude-dependence of the gravitational force.

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what if there is no given finsl velocity?
Bryce, a mouse lover, keeps his four pet mice in a roomy cage, where they spend much of their spare time, when they're not sleeping or eating, joyfully scampering about on the cage's floor. Bryce tracks his mice's health diligently and just now recorded their masses as 0.02450.0245 kg, 0.01470.0147 kg, 0.02390.0239 kg, and 0.01230.0123 kg. At this very instant, the x‑ and y‑components of the mice's velocities are, respectively, (0.515 m/s,−0.719 m/s), (−0.857 m/s,−0.215 m/s), (0.395 m/s,0.963 m/s), and (−0.743 m/s,0.759 m/s). Calculate the x‑ and y‑components of Bryce's mice's total momentum, px and py.
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but why we dont consider a thickness of mass dm ? ( of a disk)
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