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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 3m/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 $m / s^{2}$ )

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515 N

200 N

300 N

Zero

answer is A.

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Detailed Solution

$0 = (3)^{2} - 2 (a) (9) (i n d o w n w a r d d i r e c t i o n)$

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

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