A weighing scale in a moving lift measures 47N when a block of mass 4kg is kept on it. If g=9.80ms−2 then acceleration of the lift is
A
9.80ms−2 downwards
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B
9.80ms−2 upwards
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C
1.96ms−2 downwards
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D
1.96ms−2 upwards
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Solution
The correct option is D1.96ms−2 upwards Here measured mass is higher than actual mass
So lift has to be accelerating up.
Given Ng=4.8kg ⇒m(g+a)g=4.8 4g+4a=4.8g 4a=0.8g ⇒a=9.85 a=1.96