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About 60 J of energy is required to push a table 5 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about

Relative to an initial height, an object raised four times as high has a gravitational potential energy

 A pair of action-reaction forces always

If a train runs out of fuel while moving down the tracks, the engine stops. It doesn’t come to an abrupt stop due to

The attraction between Earth and Monica is equal to her weight. The reaction to Earth’s pull on Monica is

Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains

A boulder rolling down an incline has its maximum potential energy at

The first scientist to introduce the concept of inertia was

  In the Doppler effect it is important to distinguish between

 A sound wave is a/an