A block of mass 'm' moving with a speed 'υ ' compresses a spring through a distance 'x' before its speed reduces by 25% . The spring constant of the spring is
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a
mυ24x2
b
7mυ216x2
c
3mυ24x2
d
9mυ216x2
answer is B.
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Detailed Solution
Loss in KE of body = Gain in PE of spring 12M(V2−9V216)=12kx2 ⇒K=7mv216x2