A block of mass 20 kg is suspended through two spring balances with negligible mass as shown in figure. What will be the readings in the upper and lower balance respectively?
Show Hint
When force measuring instruments with negligible mass are connected in a series line, the same force propagates through all of them . Think of it like water pressure in a pipe; at any point without leaks/addition, the pressure is continuous. A common mistake is to add the masses or divide the force. Only one weight creates tension, which is then measured multiple times.
