11sir block ki initial velocity kya hai ????
12 Answers
1146 ka answer is (c) most dumb ques of 2008 and i attempted it wrong [16]
the angle between ABC is 0
62@gsns..
for the question 44
that is the speed just before colission..
see carefully
after colission the speed will change .. can you figure out why? (inelastic colission)
144.let v be the vel.before it strikes 2nd incline.
1/2mv^2=mg√3tan60.v=√60m/s.
speedof block immdiatly after sriking 2nd incline is√45m/s ,as in inelastic collision vel. component alng. line of impact is 0.
145.by enrgy conserv. 1/2mVc^2=1/2m(√45)^2
+3√3mgtan30(mg)
thus Vc=√105.
146.collisn is elastic, vertical comp. becomes√45.sin30-√15sin60=0.
so.44-b,45-b,46-c