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Notice that the sum of the kinetic and potential energies in part (C) is equal to the total energy found in part (A). That must be true for any position of the cart. ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• MASTER IT HINTS: GETTING STARTED I l'M STUCK!

When the mass is at the center and at rest, we give it a kick and increase its velocity to 0.225 m/s. (a) What is the new amplitude (in cm) of the oscillation now? A = 13 .02 I cm Use the expression for the total mechanical energy of the spring in terms of position and velocity of the block to find the maximum amplitude. (b) When the mass is at - 2.7 cm, what is its speed (in m/ s)?

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