Four identical rocks are sitting on the ground. Which rock has the most gravitational potential energy?

What is the final velocity of the initial velocity of 25 and -50?

70 give a real life example showing how sensory neurons work with the motor neurons

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)