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