Question

explane why some of the leaves may get detachedfrom a tree if we virgorously shake it branch

Answer 1

Hola it is due to Newton's First law of motion that states that  an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force...

Answer 2

Bcz tree comes in motion and the leaves were at rest ..........inertia of rest acts upon it and leaves tends to be in rest.