As mentioned, after the hovering period at 100 m
, the vehicle made a vertical powered
descent to h = 30 m, ending with a downward (!) velocity of 2 m/s at this altitude. Assume that the
engine provided a constant (!) thrust-to-weight ratio during this phase and that the gravitational
acceleration near the lunar surface is constant. How long lasted this phase of the descent?
a.
1.23 sec O
b.
9.26 sec O
c.
11.07 sec O
d.
70.00 sec O
Also given is:
Gravitational constant on the moon: 4.9028 x 10^3 km^3/s^2
Radius Moon: 1738 km
I can't seem to figure out how to solve this problem, any tips or help?