Two objects gravitationally attract with a force of 100 N. If thedistance between the two objects' centers is halved (cut in half), the new gravitational attraction is...

A900 kg roller coaster car is travelling westward on the track and begins to slow down from 18m/s to 2m/s. how long does it take the roller coaster car to decelerate if the force acting on the car to slow it is 7024n? how far does the roller coaster travel during this time?

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a. the kinetic energy increases. b.the kinetic energy decreases. c.the kinetic energy remains the same. d.the kinetic energy is always zero.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2