Question

A ball of mass 10 kg and density 1 gm/cm³ is attached to the base of a container having a liquid of density 1.1 gm/cm³, with the help of a spring as shown in the figure. The container is going up with an acceleration 2 m/s². If the spring constant of the spring is 200 N/m, the elongation in the spring is –

• A. (a) 2 cm
• A. (b) 4 cm
• A. (c) 6 cm
• A. (d) 8 cm

Answer 1

(c)

r_lV(g +a) – m (g + a) = kx

(1.1)V (g + a) – 1 × V (g + a) = 200 x

x = 6 cm