How do you solve all types of kinematics problems?

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

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

How to tell if a molecule is polar or nonpolar with electronegativity