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A block is over a plank . The coefficien...

A block is over a plank . The coefficient of friction between the block and the plank id `mu=0.2 `Initially both are at rest , suddenly the plank starts moving with accleration `alpha_(0)=4m//s^(2)` The displacement of the block in s is `(g=10m//s^(2))`

A

1m relative to ground

B

1 m relative to plank

C

zero relative to plank

D

2 m relative to ground

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The correct Answer is:
a,b
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