Two hockey players strike a puck of mass 0.300 kg with their sticks simultaneously, exerting forces of F₁ = 1330 N directed west, and F₂ = 1190 N at 0₁ = 30.0° east of north. Find the instantaneous acceleration of the puck. Find the x-component of the net force on the puck. (Define the positive a direction to be east.) Find the y-component of the net force on the puck. (Define the positive y direction to be north.) Using your forces from above, find the instantaneous acceleration of the puck.

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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?”