A fully dressed astronaut, weighing 1.2 × 103 N on Earth, is about to jump down from a space capsule that has just landed safely on Planet X. The drop to the surface of X is 2.8 m, and the astronaut’s gravitational potential energy relative to the surface is 1.1 × 103 J.
(a) What is the magnitude of the gravitational field strength on Planet X?

(b) How long does the jump take?

(c) What is the astronaut’s maximum speed?

Question

A fully dressed astronaut, weighing 1.2 × 103 N on Earth, is about to jump down from a space capsule that has just landed safely on Planet X. The drop to the surface of X is 2.8 m, and the astronaut’s gravitational potential energy relative to the surface is 1.1 × 103 J.
(a) What is the magnitude of the gravitational field strength on Planet X?

(b) How long does the jump take?

(c) What is the astronaut’s maximum speed?

anonymous · Answer

(a), 1.2x103N=(9.81)(m)               Fg=mg
m=122kg

1.1x103J=(122kg) (g) (2.81m)        PE= mgh