A stone is thrown vertically up from the ground with a velocity of 90 m/sec. How long must one wait before dropping a second stone from the top of a tower 180 m. high if the two stones are to pass each other 60 m. from the top of the tower?

An artificial satellite circles the earth in a circular orbit at a location where the acceleration due to gravity is 6.03 m/s^2. determine the orbital period of the satellite.

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

What is friction? how does it affect the motion of an object?