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EDU.VISTA, , Motion in Plane, , , , , , DPP-02, , , , , , , , A body is projected at an angle of 45° to, horizontal. Its kinetic energy of projection, is K. At the highest point, the kinetic energy, will be, (A) K, (C) K/2, , (B) 2K, (D) K*, , The horizontal range is four times the, maximum height reached by a projectile., The angle of projection is, , (A) 90° (B) 75°, , (C) 60° (D) 45°, , For angle of projection 20°, range of a, projectile is R. For the same range, another, angle of projection should be, , (A) 40° (B) 50°, , (C) 60° (D) 70°, , A stream of bullets is shot with speed v in, all directions. The maximum area covered, under firing is, , (A) xv/g, , (B) xvi?, , (C) nrv/g?, , (D) nv/g, , In a projectile motion, the height y and, distance x are given by y = 4t — 5 and x =, 3t. The acceleration due to gravity is given, , by, (A) 3 units (B) 10 units, (C) 4 units (D) 5 units, , In a projectile motion, the height y = V3 t —, 5f + # are horizontal distance x = ¢ + 2t —, FP. The angle of projection is given by, , (A) 30° (B) 60°, , (C) 45° (D) 75°, , , , 7., , 10., , A projectile is fired at angle @ with, horizontal. When the particle makes an, angle B with the horizontal, its speed, becomes v. v is given by, , (A) [email protected], , (B) [email protected], , (C) [email protected], , (D) v=ucos @.cosec B, , Two bodies are thrown up at angles of 45°, and 60° respectively, with the horizontal. If, both bodies attain same vertical height, then, the ratio of velocities with which these are, thrown is :, , (A) (B), , , , () (), , RTD] wre], , »|& Sle, , An arrow is shot into the air. Its range is, 200 metres and its time of flight is 5 s. If, the value of g is assumed to be 10 ms”,, then the horizontal component of the, velocity of arrow is :, , (A) 25 m/s, , (B) 40 m/s, , (C) 31.25 m/s, , (D) 12.5 m/s, , If R is the maximum horizontal range of a, particle, then the greatest height attained by, itis:, , (A) R, , (B)R, , (C) R/2, , (D) R/4