A ball of mass ’m’ is thrown at an angle is ‘$\theta$ ’ with the horizontal with an initial velocity ‘u’. The change in its momentum during its flight in a time interval of ‘t’ is

• A

  mgt

• B

  $\mathrm{mgt}\cos \mathrm{\theta }$

• C

  $\mathrm{mgtsin}\mathrm{\theta }$

• D

  ½ mgt.