Question

1. Explain how a boulder at rest on the ground can actually be moving at the same time.

2. Define speed. What is the difference between instantaneous and average speed.

3. What is the equation for speed? What are some possible units for speed?

4. Differentiate between speed and velocity.

Answer 1

I don't know about the 1st one but An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. Or maybe its moving because the earth is moving and gravity is pulling it with.

2. Speed is the rate at which something or someone is able to move. Instantaneous Speed - the speed at any given instant in time. Average Speed - the average of all instantaneous speeds; found simply by a distance/time ratio.

3. Speed = distance divided by time or
`s=(d)/(t)`. Some units for speed can be miles, kilometres, feet, or metres.

4. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.