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Q.

An elevator is descending with an acceleration of 4 ms-2 . The mass of the block A is 1 kg. The force exerted by A on block B is g=10 m/s2
 

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a

3 N

b

6 N

c

9 N

d

12 N

answer is B.

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Detailed Solution

WA−NB=mAa NB=WA−mAa=mA(g−a)=1(10−4)=6N

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An elevator is descending with an acceleration of 4 ms-2 . The mass of the block A is 1 kg. The force exerted by A on block B is g=10 m/s2