A simple pendulum of length 1m having bob of mass 100g is displaced through 60∘ from equilibrium position. The work done by gravity is (g=10ms−2)
-0.5J
0.5J
-0.134J
0.866J
h=l−lcosθh=l(1−cosθ)W=mghcos180W=−mgl(1−cosθ)W=−0.1×10×11−12=−0.5J