1acceleration of the block no?
Consider two observers moving with respect to each other at a speed v along a straight line. They observe block of mass m moving at a distance l on a rough surface. which of the following quantities will be same as observed by the two observers.
a} K.E. of the block at time t
b}W.D. by the the friction
c}Total W.D. on the block
D}acc. of the block.
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8 Answers
1@ srinath how can the acc be same its a vector quantity & for both of them block is moving in opp direction
i thnk KE & WD(b,c) shud be(???????)
bt i really want sm1 to interfere its an imp Q
11I think u're right Srinathl. Better go, wake Barinder up and ask him the answer. He seems 2 hv disappeared
@ Vishal, It doesn't say they are moving in opposite directions. So relative acc for each observer w.r.t the block is 0, isn't it?
1bt ani it doesnt even say dat they r moving in same dir
& also they cant move wth same rel velo in same dir (can they try to see my point plzz Q is now confusing me)
ALSO wat bout (a,b,c) they seems rite too
1I didn't give so much of a thought . saw that they were moving with same velocityies . no acclereation , so going with the general approach that frames with unifrom vel are inertial I wrote it. mine may be wrong. I'm not good in mechanics.
1me too srinath bt u better giv last few weeks to dat i got bad rank in iit only due to this factor
1357acceleration of the block will be same as observed by them as they are moving with constant velocity with respect to each other.
velocity of the block observed by them is different so KE will be different
Also displacement of the block observed by them is different, so work done by friction will be different