a 600kg wrecking ball is hung from a 20m chain and resting against a wall. if it is pulled a small distance away from the wall and released, how soon does it hit the wall?

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .