  Question

In the diagram, the spring is connected between two blocks and it is in a compressed state. Statement-1: Normal reaction on the lower block by ground is 2mg. Statement-2: In equilibrium, the net external force must be zero.

A
Statement–1 is true, statement– 2 is true; statement–2 is a correct explanation for statement–1  B
Statement–1 is true, statement– 2 is true; but statement–2 is not a correct explanation for statement–1  C
Statement-1 is true, statement-2 is false  D
Statement -1 is false, statement-2 is true  Solution

The correct option is A Statement–1 is true, statement– 2 is true; statement–2 is a correct explanation for statement–1If we take the entire arrangement as a system, the entire weight is balanced by normal reaction. Since the total weight of the system is 2mg, therefore normal reaction on lower block by the ground is 2mg. Since the system is in equilibrium so net external force on it has to be zero. Hence, statement-1 and 2 both are correct and statement-2 is the correct explanation of statement-1.Physics

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