Serious answers needed~ ✋
what is kinematics?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)