A fixed pulley is driven by a $100 \mathrm{kg}$ mass falling at a rate of $8.0 \mathrm{m}$ in $4.0 \mathrm{s}$. It lifts a load of $75.0 \mathrm{kgf}$.
(a) Calculate the power input to the pulley taking the force of gravity on $1 \mathrm{kg}$ as $10 \mathrm{N}$.
(b) the efficiency of the pulley, and the height to which the load is raised in $4.0 \mathrm{s}$.

In the given figure below draw a tackle to lift the load by applying the force in the downward direction. Mark the position of load and effort. Also if the load is raised by $1 \mathrm{m}$, through what distance will the effort move? 

In the given figure below draw a tackle to lift the load by applying the force in the downward direction and mark the position of load and effort. Also state how many strands of tackle are supporting the load?

In the given figure below draw a tackle to lift the load by applying the force in the downward direction  and mark the position of load and effort. Also answer that what is the mechanical advantage of the system?