l3. l4. l5. l6. l7. [8. Little Timmy has fallen down the well! To get him out, rescue workers lower a rope attached to a machine and Timmy ties it around his waist. The machine reels in the rope at a slow steady rate. Timmy weighs 256 N, which means gravity pulls him downward with a force of magnitude 25!] N. A. As Timmy is pulled upward at a constant speed, does the rope exert an upward force greater than, less than, or equal to 25!] N\"? Explain your reasoning. B- Timrny's parents get to the well frantic. They yell at the rescue workers, \"Speed up this machine! We want out little Timmy up here NOW!" The machine begins pulling the rope so that Timmy's speed becomes greater and greater. Is the rope exerting an upward force greater than. less than, or equal to 250 hi\"? Explain your reasoning. C- Timmy is nearing the top of the well. The machine slows down the reel in order for Timmy to come to a stop. During this time interval, does the rope exert an upward force greater than, less than, or equal to ZS N? Explain. if an object is speeding up, A. Is its acceleration zero? Explain with your reasoning. B. Is its acceleration positive? If yes, explain in what condition it can be msitive. C- Is its acceleration negative? If yes, explain in what condition it can be negative. A cheetah can go from rest to sprinting at 32 ITIJ'E {Tl} mph) in 3 seconds- How far does the cheetah travel during the three seconds? A mnner is jogging aJong a straight path. Her motion is represented on the velocity vs. time graph at right. What is her displacement over the time interval from t = it s to t = l2 s? V vuoa'ty (ml) D 4 a 12 16 Thrusts} Captain America takes his motorcycle for a ride. He starts from rest and accelerates at a rate of 3.5 szZ in a straight line until he reaches a speed of 30 rats. Cap then slows down at a constant rate of 2.0 mfsz until he stops. How much time elapses From the moment Cap starts his ride to the moment he stops, assuming there are no effects from ction or air resistance? Show your work- An object starts from rest and follows the velocity pattern represented by the graph shown below: v I Answer the following questions: A. What can you say about object's velocity from I} to t., I. to t: and t1:0 I}? B. What can you say about object's acceleration from [I to t., t. to I: and t; to t]