A ball is released at the point x$=2$mx$=2$m on an inclined plane with a nonzero initial velocity. After being released, the ball moves with constant acceleration. The acceleration and initial velocity of the ball are described by one of the following four cases: case $1,$ a$>0,$v$0>0$a$>0,$v$0>0$; case $2,$ a$>0,$v$0<0$a$>0,$v$0<0$; case $3,$ a$<0,$v$0>0$a$<0,$v$0>0$; case $4,$ a$<0,$v$0<0$a$<0,$v$0<0.$