What features were the last to form on the moon?

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.