Imagine you want to push a full wheelbarrow. what forces do you think might be involved?

- The weight of the truck is a force.

- A normal force that balances the weight and is perpendicular to the surface and opposite to the weight.

- The force of gravity that is directed towards the center of the earth.

- It also intervenes friction that is the friction between two bodies where one slides on another.

- "bill clinton ( the 42nd u.s. president, served in office from by low unemployment, declining crime rates and a budget surplus. during clinton's second term, the u.s. economy was healthy, unemployment was low and the nation experienced a major technology boom and the rise of the internet."

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b