[" (c) Haved "],[" 4.A body of mass "m" is moving in the body is "(mv^(2))/(r)" and is "],[" constant speed "v" .The force on the body is "(mv^(2))/(r)" and is "],[" directed towards the centre.What is the work done by this "],[" force in moving the body over half the circumference of the "],[" circle (RPET "1999;" Odisha PMT "2004;" MP PET "2008,09]],[" (a) "(mv^(2))/(r)times pi r],[" (c) "(mv^(2))/(r^(2))," (d) "(pi^(2))/(mv^(2))]