A ball is thrown horizontally from at A and hits the ground (4.5 sec) later at B. the line of sight from A to B makes an angle of (500) with the horizontal. Compute the magnitude of the initial velocity (u) of the ball.

It's true it didin't work becouse britain continued trading with it's colonies and the system hurt economies of the countries that used it

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it

One splits the atoms and molecules  the other combines them

It really doesn't matter for any of the questions that you've listed.