Two blocks X and Y, of masses m and 3m respectively, are accelerated along a smooth horizontal surface by a force F applied to block X as shown. What is the magnitude of the force exerted by block X on block Y during this acceleration?
1 )
$\frac{F}{4}$
2 )
$\frac{F}{3}$
3 )
$\frac{F}{2}$
$3\frac{F}{4}$
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