. The p. d. at the terminals of a battery is 25V when no load is connected and 24V when a load taking 10A is connected. Determine the internal resistance of the battery.

This is the equivalent circuit of a battery. When there is no load, the voltage across the internal resistance is zero, so the voltage at the terminals is 25 volts. When there is 10 amps flowing, a voltage is dropped across the internal resistance, so the output is 24 volts. These voltages are relative to the negative terminal.

PLS MARK AS BRAINLIST

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.