A chain, working a crane, has sectional area of 625 mm2 and transmits a load of 10 kN. When the load is being lowered at a uniform rate of 40 m/min, the chain gets jammed suddenly at which time the length of the chain unwound is 10 m. Assuming E = 200 GPa, the stress induced in the chain due to this sudden jamming is

A chain, working a crane, has sectional area of 625 mm2 and transmits

1.	A chain, working a crane, has sectional area of 625 mm2 and transmits a load of 10 kN. When the load is being lowered at a uniform rate of 40 m/min, the chain gets jammed suddenly at which time the length of the chain unwound is 10 m. Assuming E = 200 GPa, the stress induced in the chain due to this sudden jamming is
A.	100.6 N/mm2
B.	120.4 N/mm2
C.	140.2 N/mm2
D.	160.0 N/mm2
Answer» C. 140.2 N/mm2