Relation between Efficiency, Mechanical Advantage and Velocity Ratio

A simple machine is used to displace a load of 400 N through 50 cm by an effort of 100 N. If the efficiency of the machine is 80%, then the mechanical advantage and velocity ratio of the machine are: (MA,VR)

A block and tackle system of pulleys consists of $8$ pulleys. A load of $1000 \mathrm{kgf}$ is lifted by an effort of $250 \mathrm{kgf}$, efficiency is :

A weight of 500 Kg was moved through a distance of 7cm by an effort of 20 Kg which moves through a distance of 650 cm, mechanical advantage and velocity ratio of machine are (M.A,V.R)

A pulley system has $5$ pulleys in all and is $90\%$ efficient. Calculate: -
$\left(\mathrm{i}\right)$ The mechanical advantage,
$\left(\mathrm{ii}\right)$ The effort to lift a body of $1000 \mathrm{N}$.

Calculate the M.A. of a machine which can overcome a resistance of $500 \mathrm{N}$ through a distance of $0.12 \mathrm{m}$, when an effort of $100 \mathrm{N}$ acts through a distance of $0.72 \mathrm{m}$.

Calculate velocity ratio of a machine which can overcome a resistance of $500 \mathrm{N}$ through a distance of $0.12 \mathrm{m}$, when an effort of $100 \mathrm{N}$ acts through a distance of $0.72 \mathrm{m}$.

An effort of $10 \mathrm{kgf}$ is applied on a machine through a displacement of $105 \mathrm{cm}$, when a load of $200 \mathrm{kgf}$ moves through a distance of $5 \mathrm{cm}$. Calculate efficiency of the machine. 

For an ideal machine, select the correct relation between mechanical advantage($MA$) and velocity ratio($VR$).

In a movable pulley, the load is $100 \mathrm{N}$. The mechanical advantage, effort applied and V.R respectively, if the efficiency is $100$ percentage are:

A crowbar of length $120 \mathrm{cm}$ has its fulcrum situated at a distance $20 \mathrm{cm}$ from the load. Calculated the M.A.

Mechanical advantage of a machine is equal to the product of its _____ and velocity ratio.