A crate is pulled along a flat horizontal floor by a constant force of 40 N acting at an angle of 60∘ 60^\circ\,60∘ to the horizontal.
If the crate is moved a horizontal distance of 8.5 m, what is the work done by this force, expressed in SI base units?
170 kg m s−2170\text{ kg m s}^{-2}170 kg m s−2
170 kg m2 s−2170\text{ kg m}^2\text{ s}^{-2}170 kg m2 s−2
340 kg m2 s−2340\text{ kg m}^2\text{ s}^{-2}340 kg m2 s−2
340 kg m s−2340\text{ kg m s}^{-2}340 kg m s−2