Answer: The kinetic energy of the ball when it reaches halfway after being released is 49 Joules.
Step-by-step explanation:
Sum of potential energy and kinetic energy always remains constant while freely falling of the body.
At initial point : (when ball is at verge to fall down)
P.E+K.E=

At the point when ball reaches half way at height of h', h'=10 m
P.E+K.E=



The kinetic energy of the ball when it reaches halfway after being released is 49 Joules.