The diagram shows an experiment to determine the force exerted on a ball by a horizontal air flow.
The ball is suspended by a light string and weighs $0.15 N$.
The deflection of the string from vertical is $30°$. The ball is in equilibrium.
What is the force on the ball from the air flow?
1 )
$0.075N$
$0.087N$
3 )
$0.26N$
4 )
$0.30N$
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