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PHYSICS

JAMB 2013 - Question 7

Physics 2013 JAMB Past Questions - Question 7: Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-²

Choose the most appropriate option for the gap .

Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-²

A: 686N

B: 595N

C: 581N

D: 105N

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Correct Answer

Explanation

Two forcesact on a man standing in a lift or elevator: The 'man's true weight w =acting vertically downwards, and. the reaction R. of the floor; elevator on the man acting upward If the elevator acceleration down wards-with an acceleration, the unbalanced force on the man is F = ma = mg - R the apparent weight w=R=m (g-a)= 70 (10 - 1.5) = 70x8.5 = 595N