Q 51. A weighing machine consists of a 2 kg pan resting on spring. In this condition, with the pan resting on the spring, the length of the spring is 200mm. When a mass of 20 kg is placed on the pan, the length of the spring becomes 100 mm .For the spring, the undeformed length 10 and the spring constant k(stiffness) are
(A) l₀= 220 mm, k=1862 N/m
(B) l₀= 210 mm, k=1960 N/m
(C) l₀= 200 mm, k=1960 N/m
(D) l₀= 200 mm, k=2156 N/m
Answer: (B)
Explanation:
