A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t then find force exerted by ball on wall [BCECE 2005]

• A.                         \[\frac{2mv}{t}\]                  
• B.                         \[\frac{mv}{t}\]            
• C.                         \[mvt\]             
• D.                         \[\frac{mv}{2t}\]