Please explain this quesiton with first year engineering knowlodge.

Consider the circuit shown below. Values of the voltage source vs and current source 2'31 (though unknown) are fixed. You have been giventhe following measurement - Before the current source 2'52 is attached to the terminals 0 and b, the voltage v0 across the 352 resistor wasmeasured to be 5 V. What is the value of we (computed to one decimal place) after the current source 2'52 is attached if i52 =15A. Vs b