perhaps you also want to calculate the contact force between the ball and the ground.
your ball is falling from height $H$ with start velocity $v_0$ and then touch the ground. if we take a simple model of the ground with stiffness $k$ and damper $d$ you get this equation of motion.
your contact force is the spring plus the damper force (free body diagram)
to find the solution of equation (1), you need the initial conditions:
where $v_e$ is the velocity of your ball when it touch the ground:
where $v_0$ is the start velocity of ball.
This diagram shows the contact force :
the blue line is the weight of the ball. the red one is the start velocity $v_0=0$ and the green one the start velocity is $v_0=10$
you see that your contact force is much higher then the weight force and is depending on the velocity $v_e$ which is a function of the height $H$ and the start velocity $v_0$