A tennis player places a 55 kg ball machine on a frictionless surface. The machine fires a 0.057 kg tennis ball with a velocity of 36 m/s. How fast does the machine roll backwards?

Isla’s change in velocity is 30 m/s, and hazel has the same change in velocity. which best explains why they would have different accelerations? isla had negative acceleration, and hazel had positive. isla had a different time than hazel. isla had positive acceleration, and hazel had negative. isla went a farther distance than hazel.

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 difference between a red shift and a blue shift has to do with wavelength frequency. t or f