Put a fork under your pillow tonight, and your wish will come true tomorrow.
No additional force is required because it's already going downhill
The formula for average speed is

So we can just substitute our data.

- its the result
An unglazed piece of porcelain, used to test the characteristic streak of minerals by rubbing the mineral across the tile. Streak plates have a hardness of about 6.5 on the Mohs scale and cannot be used for testing harder minerals.