Which of the following compounds dissociate in water forming positive hydrogen ions?

a. sodium hydroxide
e. potassium sulphate
b. aluminium oxide
d. sulphuric acid​

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d