lightning flashes and you hear a thunder 4 seconds later. the velocity of a sound is 340 m/s how far away did the lightning strike

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference