NOTE : only need to do one of these 2, you can do the easier one!

3) A 61 kg bungee jumper jumps from a bridge. At the point when she is travelling 24 m/s, the cord starts to stretch. The cord stretches 28 m before causing her to stop completely for a moment. How fast is she travelling when the cord is stretched 12 m?

4)A 6.3 kg mass travelling south at 10.5 m/s is struck by a 2.8 kg mass travelling 21.2 m/s [E 25 N]. If the smaller mass deflects at an angle of 15 north of west at 35% of its initial speed, what is the final velocity of the larger mass?