Two forces act on a 4.5 kg block resting...

Two forces act on a 4.5 kg block resting on a frictionless surface as shown in the given figure. What is the magnitude of the horizontal acceleration of the block ?

`1.8" m"//"s"^(2)`

`1.2" m"//"s"^(2)`

`0.82" m"//"s"^(2)`

`3.2" m"//"s"^(2)`

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