3. A high jumper of mass 55 kg wishes to jump over a bar 1.8 m above the ground. Her centre of mass is located 1.0 m above the ground. (We can imagine that all of her mass is located at this point for calculation purposes.) velocity=0.4m/s and is needed to solve A a) Find the total mechanical energy of the jumper as she is clearing the bar. (2 marks) b) If she wishes to just clear the bar while travelling at a speed of 0.4 m/s, how fast must she be travelling the instant her feet leave the ground? (2 marks) c) She lands on her back on a foam pad that is 40 cm thick. At what speed will she be travelling when she first makes contact with the pad? (2 marks) d) Shortly after she lands she will be at rest. What was happened to the mechanical energy she had moments earlier? (1 mark)