Hi, can you please tell me if these are correct and if not, show me how to do it? I dont know what I am doing

Pre-Lab Questions

1. In one of your experiments, you will roll a marble down a ramp to provide an initial horizontal velocity. Suppose you start the marble at rest (v_o = 0 m/s) and it travels a distance of, d, down the ramp. Use 1-D kinematics to predict the velocity of the ball (v_f) at the bottom of the ramp. Hint: the acceleration of the ball down the ramp is 9.81*sin()m/s² whereis the angle of the ramp. Record you answer in variables (you will calculate the velocity with magnitudes when you perform the experiment).V_f = 4.43(dsin) m/s
2. Use the kinematic equations to derive a general equation for the time it takes a ball dropped from rest at vertical height, h, to reach the ground. V_f = 2gd
3. Use the result from Question 2 to write a general equation for the distance travelled by a projectile that is rolling off a table of height, h, with a horizontal speed, v_0x. D=2h/g