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A 50 kg boy stands on a platform spring scale in a lift that is going down with a constant speed 3 m/s . If the lift is brought to rest by a constant deceleration in a distance of 9m, what does the scale read during this period? ( Take g = 9.8 m/s² )

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500 N

465 N

515 N

Zero

answer is C.

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Detailed Solution

$0 = 3^{2} - 2 (a) (9) ∴ a = \frac{1}{2} = 0.5 m / s^{2} (upwards) N = m (g + a) = 50 (9.8 + 0.5) = 515 N$

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