One end of a wire 2 m long and dameter 2 mm is fixed in a celling . A naughty boy of mass 10 kg jumps to catch the free end and stays, there. The chamge is length of wire is ( T a k e r = 10 m / s² , Y = 2 × 10¹¹ N / m²
A. 3.1 85 × 10⁻⁵
B. 2 mm
C. 3 mm
D. 4mm