A book is thrown upward from a height of 10.0 m and lands with a velocity of -17.50 m/s. What was its initial velocity?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Energy can be transformed from one form to another. the diagram shows one such process. which energy transformation is represented in the diagram? nuclear to thermal and radiant nuclear to electrical and chemical chemical to nuclear and radiant chemical to electrical and nuclear