Figure shows a light spring balance connected to two blocks of mass 20 kg each. The graduations in the balance measure the tension in the spring. (A). What is the reading of the balance? (b).Will the reading change if the balance is heavy, say 2.0 kg? (c). What will happen if the spring is light but the blocks the unequal masses?

Options

A. 40 kg
B. Zero kg
C. 20 kg
D. Depends on mass of spring balance

Answer

c