Created by StemPy LabA ball is thrown at , at above the horizontal, over level ground. Ignore air resistance and take . The radius of curvature of the path at a point is the radius of the circle that best fits the path there. Which of the following statements are correct?
One or more options are correct. Tick all the correct ones: a wrong option costs marks, and a part-right answer earns part of the marks.
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← Ball A is thrown from a point O on level ground at 30 m/s, at 53° above the horizontal, towards a point Q on the ground 60 m away. At the same instant, ball B is thrown from Q, in the same vertical plane, so that the two balls hit each other in the air, as shown in the figure. Ignore air resistance, and take g = 10 m/s², sin 53° = 0.8 and cos 53° = 0.6. With what least speed, and in what direction, can B be thrown, and how high above the ground do the balls then meet?Two cars go round a large, flat roundabout, both anticlockwise, on circular lanes with the same centre O. Car A is on the inner lane, of radius 30 m, at a steady 15 m/s. Car B is on the outer lane, of radius 40 m, at a steady 20 m/s. At one instant O, A and B lie on one straight line, with A between O and B, as shown in the figure. At that instant, what is the acceleration of B relative to A (as measured by an observer who moves with A but does not turn)? →
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