Whatforces act on a apple on a tree?

An apple hanging from a tree example of Newton's first Law. In the case of the apple the force of gravity downwards balances the force of the stalk upwards so there is no unbalanced force acting on the people-it there for stays where it is. 

hope it helps :) 

1.) FORCE of GRAVITY.

2.) "TENSILE FORCE"  from the branch of the tree.

Depending on which is greater, that would have the bigger influence on the apple.

Answer sample (c); // would be best because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest;

To find speed, or mph, use distance/time.