Answer:
Explanation:
Given
Mass of alice 
Mass of bob 
Mass of beam 
Suppose fulcrum is at distance of d from bob thus From diagram
Equating torque i.e. torque of Bob,Alice and beam must cancel out each other to be balanced




Velocidad-es una cantidad vectorial física; Tanto la magnitud como la dirección son necesarias para definirlo.
The potential energy is 490 because
1•9.8•50=490 hope it helps!