ln each of the three arrangements, the block of mass ${\mathrm{m}}_1$ is being pulled left with constant velocity. There is no friction any where. The strings are light and inextensible and pulleys are massless. The ratio of the speed of the block of mass ${\mathrm{m}}_2$  in three cases respectively is:

• A

  2 : 1 : 4

• B

  2 : 4 : 1

• C

  4 : 2 : 1

• D

  Cannot be calculated