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Q.

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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a

500 N

b

465 N

c

515 N

d

Zero

answer is C.

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Detailed Solution

0=32-2a9 ∴ a=12=0.5 m/s2 upwards N=mg+a =509.8+0.5 =515 N

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