What work did you do when you have slowly lifted it 0.80 m upward? you have a 14 kg?

m = mass of the object lifted by you = 14 kg

g = acceleration due to gravity by earth on the object being lifted = 9.8 m/s²

h = height to which the object is lifted slowly = 0.80 m

W = Work done in lifting the object

work done in lifting the object is same as the gravitational potential energy gained by the object. hence

Work done = Gravitation potential energy of object

W = m g h

inserting the values

W = (14) (9.8) (0.80)

W = 109.8 J

b.

hope this : )

it has to be b, about 97 percent.