What is the momentum of a 750 kg car traveling at a velocity of 25 m/s north?

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

Explain why electric current cannot exist if a current doesn't have a voltage source.

What does si stand for,when referring to a system of measurement