Laws of MotionHard
Question
A block A is placed a long rough plank B of same mass as shown in figure . The plank is placed over a smooth horizontal surface. At time t = 0, block A is given a velocity v0 in horizontal direction. Let v1 and v2 be the velocities of A and B at time at time t . Then choose the correct graph between v1 or v2 and t.
Options
A.
B.
C.
D.
Solution
Velocity of block ′A′ at any time 
∴ v1 = v0 - μgt and velocity of ′B′ is v2 =
here v1 - t graph is a straight line of negative slope and v2 - t graph is also a string of + ve slope.
∴ v1 = v0 - μgt and velocity of ′B′ is v2 =
here v1 - t graph is a straight line of negative slope and v2 - t graph is also a string of + ve slope.
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