Earth's gravity attempts to change the velocity of all objects on earth's surface toward at a rate of 9.8 meters per seconds squared.

Earth's gravity attempts to change the velocity of all objects on Earth's surface toward CENTER OF EARTH at a rate of 9.8 meters per seconds squared.

Explanation:

As we know that the gravitational force of Earth is towards the center and it is given by the formula

this is the force experienced by all the objects near the surface of Earth and this force is towards the center of the Earth

So this is also know as gravity of Earth

Now we know that the acceleration of objects near the surface of Earth is given by the equation

this is also known as acceleration due to gravity and this is of magnitude g = 9.8 m/s/s

so all objects will move towards the center of earth with rate of change in velocity of 9.8 m/s/s

the force required to move the cart is divided by three or 33.33 n.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.