An object is lifted vertically 2.0 m and held there. If the object weighs 90 N, how much work was done in lifting it? a) 360 J b) 180 J c) 90 J d) 0 J ...
The angle of elevation of the sun, when the shadow of the pole is sqrt{3} times the height of the pole, is a) {{60}^{o}} b) {{30}^{o}} c) {{45}^{o}} d) {{15}^{o}} ...
