A 110 kg mail bag hangs by a vertical rope 3.8 m long. A postal worker then displaces the bag to a position 1.8 m sideways from its original position, always keeping the rope taut. Part A What horizontal force is necessary to hold the bag in the new position

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

c) a core temperature of only ten thousand kelvin