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Work done by a force at angle

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An object of mass = 2 kg is pulled by a constant force F = 4 N for a horizontal distance of 2 m. (the rope pulling the mass is at an angle of 30 degrees above the horizontal) What is the work done along the positive x axis? Neglect friction.

8 kg m/s^2
8 kg m^2/s^2
7 kg m/s^2
7 kg m^2/s^2

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To calculate the work done on an object by a force during a displacement, we use only the force component along the object's displacement. The force component perpendicular to the displacement does zero work.

Here given the rope pulling the mass is ...

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