What type of machine is used to measure the location of an earthquake epicenter.

Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .

Write the correct abbreviation for each metric unit

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