posted by Bill .
An Atwood machine consists of two masses (m1 = 175 grams, m2 = 485 grams) connected by a string over a frictionless pulley. The initial height above the floor is 157 cm. Both masses start from rest at point A ; point B is just as m2 hits the floor.
What is the kinetic energy of the system at point B?
What is the velocity of the system at point B?