hi, i need answer on the following questions below. please provide explanation or solution if needed so i can better understand it. thank you!

1. Force applied by massive objects on to other masses. a. Electromagnetic Force b. Tension c. Normal Force d. Gravitational Force No Answer 2. The gravitational acceleration varies with height. Which of the following expressions shows this relationship g = 80 ( R + h) g = 280 78 + 412 g = go (R + h) 2R ! = 80 ( R + h) No Answer 3. Which of the following set of coordinates can describe the position of a particle in a spherical coordinate system?| X, y, Z r. 0. r. 0. z No Answer4. A particle is moving at a velocity of v = 2t + t^2 [m/s]. What would be the acceleration of the body at t = 2 seconds? a. 4 m/s^2 b. 6 m/s^2 c. 8 m/s^2 d. 10 m/s^2 No Answer 5. A particle is moving at a velocity v = A cos (bt), where A and b are both constants. Find the position of the particle at t = 2 seconds. a. x(t=2s) = (A) (sin 2b) [m] b. x(t=2s) = (A/b) (-sin b) [m] c. x(t=2s) = (A/b) (cos 2b) [m] d. x(t=2s) = (A/b) (sin 2b) [m] No Answer 6. A particle started at x0 = 2 m moved at a velocity 3t^2 m/s. Find the final position of the particle at t =3 5. a. x =27m b. x =29 m C. x = 31m d. x =33 m No Answer 7. The instantaneous velocity of the particle is always tangent to the path taken by the particle. True or False