A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across a distance. What two simple machines make up the wheelbarrow?
wheelbarrow_and_dirt_61f0397fe9a31.jpg
a
a wheel and axle and a lever
b
a lever and a wedge
c
a pulley and an inclined plane
d
a pulley and a wheel and axle