A) He exerts on the wagon
B) The wagon exerts on him
C) The ground exerts on him
D) He exerts on the ground.
Correct Answer: C
Solution :
Horse can move forward, only due to an external force. The only external force that appears in the free body diagram of the horse is the force exerted by earth on the horse. Though this force is the result of force of action exerted by horse on the ground, but its effect is considered only in the free body diagram of earth.
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