A Horse Harnessed to a Wagon Refuses to Pull,citing Newton's

question 4

Multiple Choice

A horse harnessed to a wagon refuses to pull,citing Newton's third law,which states that for every force there is an equal but opposite reaction force.The horse,incorrect in its reasoning,can pull the wagon because

• A)after it gives a jerk and the wagon is moving,its pulling force will be greater than the reaction to this force.
• B)the law applies only to static cases.
• C)the wagon cannot possibly pull back with a force equal in magnitude to the pulling force.
• D)the action and reaction forces are acting on different bodies.
• E)after friction is overcome,the reaction force is less than the pulling force.

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Definitions:

Internal Rate

Often referring to the Internal Rate of Return (IRR), it's the discount rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero.

Cash Flows

The total amount of money being transferred into and out of a business, especially as affecting liquidity.

Outlay

The amount of money spent on a particular expense or investment.

Payback Period

The time it takes for an investment to generate an amount of income or cash equal to the cost of the investment.