1. If a rock is dropped from a 600 meter cliff, how long will it take to hit the ground?
Dl

11.1s

Explanation:

Given parameters:

Height of cliff  = 600m

Unknown:

How long it takes to hit the ground  = ?

Solution:

To solve this problem, we use one of the kinematics equation;

    H  = ut  +  gt²  

H is the height

u is the initial velocity  = 0m/s

t is the time taken

g is the acceleration due to gravity

             600 = x 9.8 x t²  

              600  = 4.9t²  

                 t²  = 122.5

                 t  = 11.1s

battery with hi vtge high val resist in series

0.11 m/s and 0.28 m/s should be correct