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
carrying a box up a flight of stairs.
c
wind blowing against a tree
d
lifting a bag of groceries
e
holding a 50 kg barbell over your head
f
pushing a grocery cart through the store
g
pushing on a car that will not move
a) lifting a rock off the ground
b) carrying a box up a flight of stairs
d) lifting a bag of groceries
g) pushing on a car that will not move