7. An airplane passenger carries 215 N suitcase up the stairs, a displacement of 4.20 m vertically and 4.60 m horizontally.
a. How much work does the passenger do on the suitcase?
b. The same passenger carries the same suitcase back down the
same set of stairs. How much work does the passenger do on
the suitcase to carry it down the stairs?

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.