Two blocks`A` and`B` are connected to each other by a string and a spring , the spring pases and a frictionlesss pulley as down over in the figure . Block `B` sides over the horizental top surface of a strionry block `C` both with the verical side of `C` , both with the same conform speed

The coefficient of friction between the surface the of block is `0.2` force constant of the spring is `1960` newtons , if mass of block `A` is `2` kg , celculate the mass of block `F` and `B` and the energy stored is the spring

Answer

A

Explanation

Since the two blocks `A` and `B` are moving with constant velocity , ther the not force acting on `A` is zero and `B` will be zero . Since the spring is loaded , if will be in a deformed state . Let the extentsion of the spring be `x`
The force are drawn .