A car of mass 1850 kg is traveling at 22.5 m/s in a straight line. A truck of mass 3170 moving in the opposite direction collides with the car and the 2 vehicles stop immediately without sliding. The speed of the truck is:

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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The magnets are probably damaged or there not strong enough to attached to the refrigerator