A particle is fired with speed u making angle θ with the horizontal. Its potential energy at the highest point is

• A

  $\frac{1}{2}{\mathrm{mu}}^2{\sin }^2\mathrm{\theta }$

• B

  $\frac{1}{2}{\mathrm{mu}}^2{\cos }^2\mathrm{\theta }$

• C

  $\frac{1}{2}{\mathrm{mu}}^2$

• D

  $\frac{1}{2}{\mathrm{mu}}^2{\sin }^{2}2\mathrm{\theta }$