A 20kg-block is released from rest at A. The block slides along the rough surface ABC to hit a 4 kg ball, which is initially at rest at C. The ball then starts sliding up along a smooth curved surface CD and eventually leaves point D in a projectile motion. The coefficient of kinetic friction between the block and the surface ABC is lk= 0.2. The coefficient of restitution between the block and the ball is e = 0.5. The distances are: LBC= 8m, LAB=25m. If the ball reaches point D with a velocity of Vp=18 m/s: State if this statement is true or false, and explain why: If the impact between the ball and the ground at E is not plastic, the horizontal x-component of the ball's velocity VE just before and after hitting the ground should stay the same. Block VD 0-60° D a=150 B-60°/ LAB Ball E В LBC y

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.