Two springs are in a series combination and are attached to a block of mass `'m'` which is in equilibrium. The spring constants and extension in the springs are as shown in the figure. Then the force exerted by the spring on the block is :

Options

A. `(k_(1)k_(2))/(k_(1)+k_(2))(x_(1) + x_(2))`
B. `k_(1)x_(1) + k_(2)x_(2)`
C. `k_(1)x_(1)`
D. None of these

Answer

C

Explanation

Tension both springs are same
i.e., `k_(1)x_(1) = k_(2)x_(2) = mg =` force exerted by lower spring on the block.