$A$ particle of mass $m$ is projected with speed $u$ at angle $\theta$ with the horizontal from the ground. The work done by gravity on it during its upward motion is ..........
- A$\frac{m u^2 \cos^2 \theta}{2}$
- B$\frac{-m u^2 \sin^2 \theta}{2}$
- C$\frac{m u^2 \sin^2 \theta}{2}$
- DZero
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