6th grade math , help me pleasee :)

Find the values of y: 3y^3(y^2+ 2/3y)=0

How do newtons third law of motion demonstrates on a rollar coster

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7