The mass of the earth is 5.98 × 1024 kg. a 6.83 kg bowling ball initially at rest is dropped from a height of 2.12 m. the acceleration of gravity is 9.8 m/s^2. what is the speed of the earth coming up to meet the ball just before the ball hits the ground?
how do you solve this?

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

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

Which accurately compares concave and convex lenses?