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A young man of mass 60 kg stands on the floor of a lift which is accelerating downwards at 1m/s then bhereaction of the floor of the lift on the man is(1) 528 N15.(Take g 9.8m/s)(4) none(2) 540 N(3) 546N |
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Answer» 1]When lift is moving upwardsWeight = m(g + a)= 60 kg × (10 + 2) m/s²= 720 N [2]When lift is moving downwardsWeight = m(g - a)= 60 kg × (10 - 2) m/s²= 480 N AS IT MOVE DOWNARDS SO THE Tension in a string is equal to reaction forcetherefore reaction = m(g-a) = 60(9.8-1) = 528N |
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