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Q. Two blocks (m = 1.90 kg and M = 10.5 kg) and a spring (k = 260 N/m) are arranged on a horizontal frictionless surface. The coefficient of static friction between two blocks is 0.350. What amplitude of simple harmonic motion of the spring-blocks system puts the smaller block on the verge of slipping over the larger block?

Q. If a beach ball with a mass of 0.08kg is thrown vertically upward in a vacuum so there is no drag force on it, it reaches a height of 10 meters. If the ball is thrown upward with the similar initial velocity but in air instead of a vacuum, it reaches a height of 8.4 meters. What is the drag force (Assume that is constant) on the ball throughout the motion of the ball?

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