Question: Why do objects slow down when there is nothing pushing them?

Observe: Use the Gizmo to explore the question above. Try different objects and surfaces. Each time, turn the fan Off while the cart is moving. (You may find it helpful to pause the Gizmo with the Pause ( ) button, turn the fan off, and then click Play to restart.) 2. Form hypothesis: What causes an object to slow down after no longer being pushed

An object slows down after being pushed due to the energy within the object being used up in doing work against frictional forces between the object and the floor, and work done again viscosity forces between the air molecule and the surface area of the object in contact with the air molecule.

This is in accordance with Newton's first law of motion which states that an object in Motion or rest will continue in that state unless being acted upon by an external force.

Some of the energy is seen to be transformed into heat and sound by these forces forcing the object to slow down and stop if no longer pushed

the velocity you are looking for is made up of two parts: horizontally velocity, vh, and its vertical velocity, vv. the actual velocity of the ball will be these two parts added together, and because velocity is a vector then they will need to be added vectorially.  

neglecting air resistance etc etc.,  

the horizontal velocity component will be constant (because there is no accelerating force in the horizontal direction.  

vh = 8 ms-1  

the vertical velocity component has an accelerating force: 'g'.  

using v = u +at where a = g = 9.81 ms-2.  

the vertical component of velocity, vv = 0 + gt = vv =9.81 x 2  

vv = 19.62 ms-1 . the zero appears because the virtical component of velocity at time t=0 is zero. remember, the ball was thrown horizontally.  

how fast it will be moving (it actual path (being a parabola )) will be the vector sum of these two.  

adding vectorally gives: -  

v = sqr root (8^2 + 19.62^2) = sqr root(64+384.9) = 21.18 or 21.2 ms-1

i would say the answer is food.

hope this !