Laws of MotionHard
Question
A block is placed over a plank. The coefficient of friction between the block and the plank is μ = 0.2. Initially both are at rest. suddenly the plank starts moving with acceleration a0 = 4 m/s2. The displacement of the block in 1 s is (g = 10m/s2)
Options
A.1 m relative to ground
B.1 m relative to plank
C.zero relative to plank
D.2 m relative to ground
Solution
Acceleration of block w.r.t plank
= 2ms-2
Acceleration of block w.r.t plank
= a = 2ms-2
Now s = ut +
at2 gives s = 
(2)(1)2 = 1 m (w.r.t ground & w.r.t. plank )
= 2ms-2Acceleration of block w.r.t plank
= a = 2ms-2Now s = ut +
at2 gives s = (2)(1)2 = 1 m (w.r.t ground & w.r.t. plank )Create a free account to view solution
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