A skydiver jumps from a slow-moving airplane. The skydiver's mass is 84.5 kg. After falling for some distance, she reaches a terminal speed of 53.4 m/s. (a) What is her acceleration (in m/s2) when her speed is 30.0 m/s? magnitude_______direction______ (b) What is the drag force (in N) on the skydiver when her speed is 53.4 m/s? magnitude________direction_____ (c) What is the drag force (in N) on the skydiver when her speed is 30.0 m/s? magnitude______ Ndirection______

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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?”