State whether the following statement is true or false:
When an arrow is released from a bow,potential energy changes into kinetic energy.

Does the work done in raising an object vertically depend upon how fast it is raised?

How much work is done by a weight lifter when he holds a weight of $80 \,kg$ on his shoulders for two minutes?

$(a)$ Define average power. Calculate the total energy consumed in the month of November in a household in which four devices of power $500\, W$ each are used daily for $10\, hours.$
$(b)$ $A$ freely falling object eventually stops on reaching the ground. What happens to its energy?

$(a)$ Define work done by a constant force on an object. Write an expression for the work done.
$(b)$ How much work will be done on an object by a force if the displacement of the object is zero?
$(c)$ What is the kinetic energy of an object? Write an expression for the kinetic energy of an object of mass $m$ moving with a speed $v$.

When a ball is lifted to a height of $h$ and then dropped,what is the kinetic energy of the ball just before it touches the ground?