Answer:-
[tex]\longrightarrow \textsf{D. A bicycle sitting on the ground} [/tex]
Solution:-
Let us check all options -
- A) An apple falling from a tree is under the influence of gravity. Thus some force is acting on the apple and it can not said to be in state of equilibrium.
- B) A car moving at a constant velocity may said to be in state of equilibrium but the since the car is in motion ,equilibrium is dynamic in nature .Thus , it is not in static equilibrium.
- C) A motorcycle speeding up has some acceleration due to some forces. Thus it can also not be said in state of static equilibrium.
- D) Since the force acting on bicycle sitting down in zero as well as it is in state of rest , thus bicycle sitting on the ground may said to be in static equilibrium.
