We did a demonstration in class involving a "happy" and "sad" ball of equal mass. Each ball separately rolled down a ramp from the same height. When the balls hit a block at the end of the ramp, the ball that bounced off the block was the only one that was able to knock the block over. Why? It had about twice as much kinetic energy. It had about twice as much velocity. It had about twice as much momentum. It had about twice as much impulse