A rifle fires a 10-g bullet with a horizontal speed of 300 m/s . The bullet strikes a block of wood and the bullet penetrates to a depth of 12 cm into the wood before coming to a stop. 1. Draw the motion and force diagrams for the bullet while it is coming to a stop.  ignore the weight vector . 2. What resistive force (assumed to be constant) does the wood exert on the bullet? 3. How many seconds does it take the bullet to come to rest?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”