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M1 question

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missbeautiful789:
A box of weight W rests on a platform. When the platform is moving upwards with an of acceleration ?, the normal contact force from the platform on the box has magnitude kW. When the platform is moving downwards with acceleration 2?, the box remains in contact with it. find the normal contact force in terms of k and W, deduce that k ? 3/2

astarmathsandphysics:
2 hours

astarmathsandphysics:
moving up res kW-W=Wa/g (1)
moving down W=W*2a/g so a=g/2
sub into (1) kW-W=W/2 so KW=3W/2 so k=3/2

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