Question

Two blocks, with masses m and 3m, are attached to the ends of a string with negligible mass that passes over a pulley,as shown above. The pulley has negligible mass and friction and is attached to the ceiling by a bracket. The blocks are simultaneously released from rest.
(b) Determine the work done by the string on the two-block system as each block moves a distance d.

Answer 1

Answer:

Explanation:

b )

T = 2m₁m₂g /  (m₂ + m₁)

= 2 x m x 3m g / 4m

= 14.7 m

Work done by tension on both the masses in moving by distance d

= 2 x 14.7 m x d    ( 2 x force x displacement )

= 29.4  md .