Explain how the earth is round and not flat

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Adiagram show how a converging lens can produce a real image and virtual image