EASY
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A projectile is thrown at a speed which is twice its speed at its maximum height. If R and H are its range and maximum height respectively then the ratio RH is

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Important Questions on Kinematics

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A ball is dropped from a bridge that is 45 m above the water. It falls directly into a boat which is moving with constant velocity. The boat is 12 m away from the point of impact when the ball is dropped. The speed of the boat is (Take g=10 m s-2)
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A boy runs on a horizontal road with a speed of 4 m s-1 while it is raining. He sees that the rain is making an angle θ with the vertical while running from west to east. However, when he runs from east to west, the angle is α. The rain is pouring down at an angle 45° with the vertical and at a speed of 8 m s-1 as shown in the figure. The ratio tanθtanα is,