As block is pulled at a constant speed, the net force on block is zero. ⇒F=mgsin‌θ Now work done by this force (F= tension ) in displacing block by a distance d along the incline, Work done = Force × Displacement ⇒W=mg‌sin‌θ×d Here, m=2‌kg,θ=30∘,d=4m W=2×10×