. A block of mass 4 kg is suspended through

two light spring balances A and B in series. Then A and B will be read respectively

A: 4 kg and zero kg

B: zero kg and 4 kg

C: 4 kg and 4 kg

D: 2kg and 2 kg

Explanation:

Given: mass, m = 4 kg

Both the spring balance A and B will have the same reading i.e. 4 kg

Let F₁ be the spring force of upper spring and F₂ be the spring force of lower spring

F₂ = 4g and (F₁ - F₂) = 0 ⇒ F₁ = F₂ = 4g

Therefore, reading in both spring balance will be 4 kg

Final answer:

Hence the correct option is (C), i.e. 4 kg and 4 kg

Related questions