Question

The magnitude of gravitational potential energy of the moon-earth system is U with zero potential energy at infinite separation. The kinetic energy of the moon with respect to the earth is K.

Options

• U < K

• U > K

• U = K

Answer 1

U > K

For a system to be bound , total energy of the system should be negative.As we know that kinetic energy can never be negative.
E<0 & K>0  & E=K+U
it gives that U>K