When a ball is dropped it is easy to see that earth exerts a force on it. why cant you tell that the ball exerts a force on it. why can't you tell the ball exerts a force on earth

The particles that are found in the nucleus of an atom are

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?