letter in the space provided. (1.0 pt each) 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 |Ã| = |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 x₂i n 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: A. B. 2v(n+1) v(n-1) C. 2v(2n+1) n D. Zv(n-1) n 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 C. Vertical component of velocity B. Horizontal component of velocity D. None of the above 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​