Reaction Time Physics│Please Help!

Question

1.A ball rolls down a 4 m ramp in 8 s. What is the average velocity of the ball?

2.A car is sitting at a red light. When the light turns green the car accelerates at 3 m/s^2. How long will it take for the car to reach a velocity of 12 m/s?

3.A rock is dropped into a very deep well. It takes 6 s for the rock to hit the water in the bottom of the well. What is the velocity of the rock just before it hits the water. Assume g = -10 m/s^2

4.A rock is dropped into a very deep well. It takes 6 s for the rock to hit the water in the bottom of the well. How deep is the well? . Assume g = -10 m/s^2

Answer 1

A. Use the equation:

V_avg = Δx/Δt where V_avg is the average velocity, Δx is the total change in distance (4 m), and Δt is the total change in time (8 s).

B. Use the equation v_f = v_i + at where v_f is the final velocity (12 m/s), v_i is the initial velocity (which is zero), "a" is the acceleration (3 m/s²), and "t" is the time. Solve for "t"

C. Use the equation v_f = v_i + at where v_f is the final velocity you are trying to find, v_i is the initial velocity (which is zero), "a" is the acceleration (-10 m/s²), and "t" is the time (6 seconds). Solve for v_f (it will be a negative number because it is downwards).

D. Use the equation x = (1/2) at² + v_it where t = 6 seconds, a = -10 m/s², v_i = zero Solve for "x" (it will be a negative number because it is downwards).