Leah watches a toy car move across a table at a constant speed. the car moves across the table in one direction and falls off the other side. leah decides to try another situation. she watches the car move across the table at a constant speed, then when it reaches the other side of the table, her friend joey pushes the car in the other direction. the car moves back to leah. based on leah's informal experiment, the car changes direction because of force, which happens when a. an unbalanced; leah watches the car b. an unbalanced; joey pushes the car c. a balanced; the car moves across the table d. a balanced; joey pushes the car

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?