1. The problem statement, all variables and given/known data 1. A 2 kg block and 8kg block are both attached to an ideal spring (k= 200N/m) and both are initially at rest on a horizontal frictionless surface. In an initial experiment, a 0.1kg ball of clay is thrown at the 2 kg block. The clay is moving horizontally with speed v when it hits and sticks to the block. The 8kg block is held still by a removable stop. As a result, the spring compresses a maximum distance of 0.4m. In a second experiment, an identical ball of clay is thrown at another identical 2kg blcok, bu this time the stop is removed so that the 8kg block is free to move. d. State whether the maximum compression of the spring will be greater than, equal to , or less than 0.4m. Explain briefly. e. State the principle(s) that can be used to calculate the velocity of the 8kg block at the instant that the spring regains it original length. Write the appropriate equations and show the numerical substitutions, but do not solve for the velocity 2. A 5kg ball initially rests at the edge of a 2m long, 1.2m high frictionless table. A hard plastic cube of mass 0.5kg slides across the table at a speed of 26 m/s and strikes the ball, causing the ball to leave in the direction in which the cube was moving. b. Determine the horizontal velocity of the ball immediately after the collision. c. Determine the cube's speed and direction of travel (if moving) immediately after the collision. d. Determine the kinetic energy dissipated in the collision. e. Determine the distance between two points of impact of the objects with the floor 2. Relevant equations Conservation of energy, momentum 3. The attempt at a solution 1.I solved part a,b,c already. In part d, I guess it will less than 0.4 but don't know how to explain that. I also need some hints on part e too 2. I solved part a which was a graph question. Part b,c since I don't know the type of collision ( I think it is elastic) so I can't use conservation of momentum. ANy hint ?? Part d: I guess I will calculate KE of the cube initially and KE of the cube after collision and their difference is the answer right ?? Part e: I don't understand the question, can any one explain for me ??