2 Answers
eureka123
·2009-09-12 10:37:20
http://www.targetiit.com/iit-jee-forum/posts/constraint-equation-1305.html
eureka123
·2009-09-12 10:38:06
here also with good discussion
http://www.targetiit.com/iit-jee-forum/posts/laws-of-motion-2575.html