Need help Asap Scan this on your phone (its my presentation need to know if its good ) I will give brainliest

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

True or false: the revolution of the earth creates day and night as it rotates around the sun

What’s #16 asking me and how do i solve it?