What quantity can you calculate if you know that a car travels 30 km inn 20 minutes?

Knowing the distance covered and the time to cover the distance,
you can calculate the car's average speed during that time.

           Average speed = (distance covered) / (time to cover the distance)

           Average speed  =  (30 km) / (20 minutes)  =  1.5 km/minute .

Note:  You do NOT have enough information to calculate velocity.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

Learned about life itself