A police officer is chasing a purse snatcher down a street. the thief start 9 meter ahead of the officer and can run 20 meters in 4 seconds (5m/s).The police officer can run 32 meter in 4 seconds (8m/s).How long will it take the officer catch the thief ??

Phosphorous can form an ion called phosphide, which has the formula p3−. this ion can form an ion called phosphide, which has the formula p3−. this ion properties very similar to those of pforms when a phosphorus atom loses three protonsis called a cationcontains 18 electrons