In Figure 5-17 Wilbur asks Mr. Ed, the talking horse, to pull a cart. Mr. Ed replies that...

In Figure 5-17 Wilbur asks Mr. Ed, the talking horse, to pull a cart. Mr. Ed replies that he would like to, but the laws of nature just won’t allow it, According to Newton’s third law, he says, if he pulls on the wagon it pulls back on him with an equal force. Clearly, then, the net force is zero and the wagon will stay put. How should Wilbur answer the clever horse?

Figure 5-17