A mass attached to a spring oscillates with a period of 4 sec. After 4 kg are added, the period becomes 6 sec. Assuming that we can neglect any damping or external forces, determine how much mass was originally attached to the spring.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

The dot diagram represents the motion of the motorcycle as it moves from left to right