1. For given two vectors that A + B = 2i + 6j+2k and A - B = 4i +2j-10k, what is the value of A.B? A. -4 B.-20 C.-24 D. -19 2. The angle between two vectors A and B is 60°. Find their resultant if | A| = |B| = 8 units. A. 8√2 units C. 4√3 units B. 8 units D. None of them 3. A race car traveling at 60m/s slows down at a constant rate to a velocity of 30m/s over 10sc. How far does it move during this time? A. 900m B. 150m C. 450m D. 360m 4. A tennis ball is thrown straight up with an initial speed of 20m/s. It is caught at the same distance above the ground. How high does the ball rise & how long does the ball remain in air? A. 40m; 4sec B. 20m; 4sec C. 40m; 2sec D. 20m; 2sec 5. A projectile is fired at an angle of 30° above the horizontal with initial speed of 30m/s. It hits its target after 2 sec. How high is its target above the horizontal? A. 40m B. 22.5m C.11.2m D. 10m 6. A particle starts from rest with constant acceleration for 20 sec. If it travels a distance x₁ in the first 10 sec and a distance x₂in the next 10 sec then A. x₂ = 2x₁ B. x₂ = 3x1 C. x₂ = 4x1 D. x₂ = 5x1 7. A stone is thrown vertically upwards from cliff with velocity 5 m/s. It strikes the pond near the base of cliff after 4 sec. The height of cliff is A. 6 m B. 60 m C. 40 m D. 100 m 8. A body initially at rest is moving with uniform acceleration a. Its velocity after n second is v. The displacement of the body in 2 sec is: v(n-1) A. B. 2v(n+1) C. 2v(2n+1) n D. Zv(n-1) 9. A stone is projected upwards and it returns to ground on a parabolic path. Which of the following remains constant? A. Speed of the ball B. Horizontal component of velocity D. None of the above C. Vertical component of velocity 10. Two different masses m and 2m are fallen from height H₁ and H₂ respectively. First mass takes t sec and another takes 2t second, then the ratio of H₁ H₂ is A. 2:1 B. 4:1 C. 1:4 D. None of these
