Which of the following objects is in static equilibrium? a- an apple falling from a tree b- a bicycle sitting on the ground c- a motorcycle speeding up d- a car moving at a constant velocity

b- a bicycle sitting on the ground

Explanation:

'Static' means it's not moving.

So, only the answer listed as "a bicycle sitting on the ground" corresponds to that condition.

All others possible answers describe something that is moving (an apple falling, a motorcycle accelerating, a car moving at a constant speed).  Even if they are going at a constant speed, they are moving, so not static.

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