Which of the following is an example of Newton’s first law of motion? Sam’s bike hits a curb and he flies over the handlebars, onto the grass.
A feather and a brick are dropped from a ladder. The brick exerts a greater force when it hits the ground.
A person sits on a chair and pushes down, and the chair pushes upwards on the person.
Tires from a car push against the road, and the road pushes back.

I think first one

Explanation:

Because his first law of motion was every object will remain at rest or uniform motion in a straight line

Sam's bike hits a curb and he flies over the handlebars, onto the grass.

Explanation:

As we know that: Newtons first law of motion states that a body continues to remain in the inertia of rest or motion, unless it is forced to change by applying an unbalanced force. Sam's bike is in uniform motion when suddenly the curb(external force) hits it and makes Sam to fall.