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On the floor of an elevator, a block of mass 50 kg is placed on which another block of mass 20 kg is also placed. The elevator is moving up with a constant acceleration 1.5 m/s2. Force exerted by 20 kg block on the 50 kg block is nearly:

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a

250 N

b

230 N

c

170 N

d

150 N

answer is B.

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Detailed Solution

FBD of 20 kg,N−20g=20(1.5)⇒N=230 newton

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On the floor of an elevator, a block of mass 50 kg is placed on which another block of mass 20 kg is also placed. The elevator is moving up with a constant acceleration 1.5 m/s2. Force exerted by 20 kg block on the 50 kg block is nearly: