At what speed does a 1800 kgkg compact car have the same kinetic energy as a 15000 kgkg truck going 22 km/hkm/h

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d