A dynamic cart moving at 4 m/s is run into the back of and sticks to an identical cart. At what speed should the two carts move off together?

Ireally need this answer sombody fast fast

Organelles are 1. responsible for producing power for the cell 2. tiny structures in the cell that carry out the cell's activities 3. responsible for digestion in the cell 4. found outside of the membrane

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?