Two pieces of clay are moving directly toward each other. when they collide, they stick together and move as one piece. one piece has a mass of 324 grams and is moving to the right at a speed of 1.15 m/s. the other piece has mass 625 grams and is moving to the left at a speed of 0.87 m/s. what fraction of the total initial kinetic energy is lost during the collision? in other words what is (ke? ? )/ kei?

2. a 1510 kg mid-size car traveling east at 16.4 m/s collides with a 2320 kg mid-size truck traveling north at 31 m/s. assume that the vehicles upon collision lock together in such a way as to prevent them from separating or rotating. calculate the angle northward from due east (counterclockwise) that the locked cars move toward immediately after the impact.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.