Aball rolls start at the top of a hill and rolls down with a velocity of 24m/s after 8s. what is the velocity of the ball?

Explanation:

I assume you are asking for the acceleration of the ball, not the velocity (in fact, the velocity is already given).

The acceleration is:

where in this case we have:

v = 24 m/s is the final velocity

u = 0 is the initial velocity

t = 8 s is the time interval for the velocity to change

Solving the equation,

see earlier

massxgravity x heght=weightxheight= pe

4900=490xh

h=10