A landing craft approaches the surface of Pen- itgy, a planet in a far-away gala

ID: 2121991 • Letter: A

Question

A landing craft approaches the surface of Pen-

itgy, a planet in a far-away galaxy. The land-

ing craft has two engines attached to the bot-

tom, each angled 30 from the vertical. The

landing craft is pointing upward, as shown.

A total upward thrust of 14460 N is required

for the landing craft to descend at constant

speed. When the landing craft has a total

upward thrust of 1460 N, the landing craft%u2019s

acceleration is ?1.42 m/s2, (its speed will be

increasing if its velocity is downward toward

the surface of planet Penitgy).

If the craft is descending vertically down-

ward, what is the mass of the landing craft?

Answer in units of kg

14460 - mg = 0
so mg = 14460

1460 - mg = m(-1.42)

1460 - 14460 = m*-1.42

m=9155 kg

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