Which of the following is an example of Newton’s second law of motion? ACatie’s skateboard hits a curb and she falls forward onto the grass.

Ba tissue and a rock are dropped from a ladder. The rock exerts a greater force when it hits the ground.

Ca person stands on a chair and pushes down, and the chair pushes upwards on

the person.

DTires from a bike push against the road, and the road pushes back.

B

Explanation:

Newton’s Second Law of Motion

Newton’s Second Law of Motion states that ‘when an object is acted on by an outside force, the mass of the object equals the strength of the force times the resulting acceleration’.

This can be demonstrated dropping a rock or and tissue at the same time from a ladder. They fall at an equal rate—their acceleration is constant due to the force of gravity acting on them.

The rock's impact will be a much greater force when it hits the ground, because of its greater mass. If you drop the two objects into a dish of water, you can see how different the force of impact for each object was, based on the splash made in the water by each one.

if they have a finite resultant

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s