A block having mass M M slides on a frictionless surface and collides with a block of mass 2 M , 2M, which is initially at rest. After the collision, the small block is at rest and the larger block is moving to the right with speed V / 2 . V/2. Is this collision elastic?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?