An apple weighing 150 g hangs on a tree branch. What is the weight of the apple and the force of elasticity?

The weight of an apple is equal to its action on a support or suspension. Usually it’s just mg if the body is just standing on the table, for example.
P = mg = 0.15 * 10 = 1.5 (N)
The body acts on the branch with a force P, as it pulls it down. But since we have an equilibrium position (everything is hanging), the elastic force is numerically equal to the weight:
P = F_control = 1.5 (N)
Eventually:
P = F_control
Answer: P = F_cont = 1.5 (N)