Fossils allow scientists to determine when and for how long a certain species lived. what can scientists deduce from this discovery? a. earth's life has changed over time b. which fossils are heavier c. explain how earth remained unchanged d. the food sources that were available

1. you serve a volleyball with a mass of 2.1 kg. the ball leaves your hand with a speed of 30 m/s. the ball has energy. calculate it. 2. a baby carriage is sitting at the top of a hill that is 21 m high. the carriage with the baby weighs 12 n. the carriage has energy. calculate it. 3. a car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. the car has . calculate it.