Two students on roller skates stand face-to–face, and then push each other away. One student has a mass of 90.0 kg; the other has a mass of 60.0 kg. If the student of mass 90 kg has a speed to the south of 4 m/s after the push, what is the velocity (both magnitude and direction) of the student of mass 60 kg?

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.

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