A block of mass m is suspended by a light thread from an elevator. The elevator starting from rest is accelerating upward with uniform acceleratio a. The work done by tension on the block during t seconds is

A block of mass m is suspended by a light thread from an elevator. The

1.	A block of mass m is suspended by a light thread from an elevator. The elevator starting from rest is accelerating upward with uniform acceleratio a. The work done by tension on the block during t seconds is
Answer» `m/4[g+a]at^(2)` `m[g+a]at^(2)` `m/2[g+a]at^(2)` `2M[g+a]at^(2)` ANSWER :B