Q: A system of wedge and block as shown in figure, is released with the spring in its natural length. All surfaces are frictionless. Maximum elongation in the spring will be
(a) (2mg sinθ)/K
(b) (mg sinθ)/K
(c) (4mg sinθ)/K
(d) (mg sinθ)/2K
Ans: (a)
Sol: $\large mgsin\theta \times x = \frac{1}{2}kx^2$