Created by StemPy LabA merry-go-round is turning at when its motor is switched off. It then slows down at a steady rate and stops later. A child sits on it, from the axis. What is the size of the child's acceleration at the moment when the merry-go-round has turned through half of the angle that it turns through while stopping?
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← A girl stands on a flat cart that moves along a straight, level track at 4.0 m/s. She throws a ball straight up, as she sees it, at 15 m/s relative to herself. At the moment of the throw, the cart begins to speed up with a steady acceleration of 2.0 m/s² along the track. Her hand stays at the same place on the cart. Ignore air resistance and take g = 10 m/s². When the ball comes back down to the height from which it was thrown, how far behind her hand is it? Give the answer in m.A stone is thrown from level ground at 16 m/s, at 53° above the horizontal. Ignore air resistance, and take g = 10 m/s², sin 53° = 0.8 and cos 53° = 0.6. At one instant during its flight, the stone's velocity is at right angles to its velocity of projection. What is its speed at that instant? Give the answer in m/s. →
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