Which of the following are examples of work being done on an object? Choose the 4 that apply.
a
Lifting a rock off the ground
b
Pushing on a car that will not move
c
Wind blowing against a tree
d
Carrying a bag of groceries to the car
e
Pushing a grocery cart through the store
f
Carrying a box up a flight of stairs
g
Lifting a bag of groceries
h
Holding a 25 kg barbell over your head