1)  a) What is the work done when a box weighing 10N is lifted up onto a shelf 2m above the floor? b) If we consider the acceleration due to gravity to be 10 ms^-2 and the same box (weighing 10N) moves at 10 ms^-1 how much kinetic energy is used? c) How much potential energy does the box have when it is on the shelf? d) Thinking about the conservation of energy, if a block of mass 20kg falls off a shelf that is 3m above the ground what is the velocity of the box just before it hits the ground?

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