Two trolleys 1 and 2 are moving with acceleration a 1 and a 2 respectively in the same direction. A block of mass 'm' on trolleys 1 is in equilibrium from the frame of observer stationary w.r.t. trolleys 2. The magnitude of friction on block due to trolley is –
Text Solution
Verified by ExpertsThe correct answer is:
B
Since m is in equilibrium w.r.t. observer, acceleration of m should also be 
. So net friction force (as there is no other horizontal force on m) acting on m should be mass 
acceleration 
.
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