Two blocks, of mass $0.20 kg$ and $0.50 kg$, are connected by a light inextensible string that passes over a frictionless pulley.
The blocks are initially held stationary. The block of mass $0.20kg$ rests on a rough horizontal surface.
The block of mass $0.50 kg$ is suspended in air. Air resistance is negligible.
When the blocks are released, they have an acceleration of magnitude $2.0 m s^–2$.
What is the magnitude of the frictional force between the block of mass $0.20 kg$ and the rough surface?
$3.5N$
2 )
$3.9N$
3 )
$4.5N$
4 )
$6.3N$
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