How to know which equation of motion to use where?explain

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?