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Q. A spring is mounted at an angle of = 34 on a frictionless incline as illustrated in the figure below. The spring is compressed to 15 cm where it is allowed to propel a mass of 4 kg up the incline.

If the spring constant is 550 N/m, how fast is the mass moving when leaves the spring?

Q. A 46.8 kg girl is standing on a 169 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.48 m/s relative to the plank. What is her velocity relative to the ice surface?

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