Two rocks, one of mass 30 kg and the other of mass 60 kg, are separated by a distance of 1.0 m. They exert a gravitational force on each other of magnitude F. Which other pair of rocks exert a force of magnitude F on each other? A. a rock of mass 100 kg and a rock of mass 18 kg, separated by 1.0 m
B. two rocks, each of mass 45 kg, separated by 1.5 m
C. two rocks, each of mass 45 kg, separated by 1.0 m
two rocks, each of mass 60 kg, separated by 2.0 m

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

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.