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A spring balance,which is suspended from the roof of a lift, carries a mass of...

Physics
WAEC 2001
A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms-2, determine the reading on the spring balance. [g = 10ms-2]
  • A. 24.0N
  • B. 12.5N
  • C. 7.5N
  • D. 4.0N
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Correct Answer: Option B
Explanation
F = ma

= 1 x 2.5 = 2.5N

weight = mg = 1 x 10 = 10N

Reading = F + Wt = 2.5 + 10

= 12.5N
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