When the planet suddenly stops, the atmosphere will continue to move. This will cause a gigantic wind speed of about 1000 mph. Such winds will certainly cause erosion of the earth’s crust and destruction.
Even in the absence of wind during a sudden stop, any object on the planet will continue to move by the force of inertia. At the equator, objects will begin to fly at a speed of 1000 mph, and closer to the poles, the speed will be lower in about two times. This is a very high speed, but it is not enough to launch any object into space. So, no need to worry about any space travel.
At the equator, the convexity, due to the centrifugal force of the Earth’s rotation, will disappear. If the bulge disappears
Underwater would be large parts of Europe, Asia, North America and whole Antarctica. The waters of the largest group of freshwater lakes in the world (Great Lakes) would dissolve in the ocean. And the former deep ocean trenches would become inland seas.
Since the rotation will stop for only 60 seconds, the bulge will not completely disappear. However, such a stop will be enough to cause a giant tsunami, but less than for 60 seconds. Then, the floods will recede, causing more chaos.