I think the best way to answer to this kind of question because some of the elements are missing specially the mass of the book is just states the variables and assigned as the mass of an object. So the initial velocity of an object starts at zero and increase rapidly by 9.8 m/s^2 because it is due to gravity
Answer:a
Explanation:because you might not know if each object would attract each other because we already know that a soup can and a spoon and also the pencil will not attract to each other but the paper clip will attract to the magnet
Answer:
efficiency = useful energy out ÷ total energy in (for a decimal efficiency)
or.
efficiency = (useful energy out ÷ total energy in) × 100 (for a percentage efficiency)
Explanation: