A student drops a ball off the top of building and records that the ball takes 3.49s to reach the ground. Determine all unknowns and answer the following questions. Neglect drag. What was the ball's speed just before striking the ground?

J. j. thomson’s experiment disproved the theory that an atom

Which planet do you think would be easiest for humans to colonize some day?

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600