1.

A block of mass m moving at a speed v compresses a spring throgh a distance x before its speed is halved. Find the spring constant of the spring.

Answer» Correct Answer - B::C::D
`E_(i) = E_(f)`
`:. (1)/(2)mv^(2) = (1)/(2)m((v)/(2))^(2) + (1)/(2)kx^(2)`
or `k = (3v^(2)m)/(4x^(2))`


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