Vp = Vs + Kp(Vl - Vs) Kp
If you only have the speed/time graph, you can't calculate force out of it. You could if you also knew the mass of the object that's speeding along, but not with the speed alone.
the speed
I'm sure that average speed would be easier to calculate than instantaneous speed. To calculate average speed, just take the time that it takes to travel between two points, and divide that into the distance between the points.
Speed = Wavelength X Frequency
time = distance ÷ speed
Speed = Wavelength X Frequency
Yes.
You can calculate speed by dividing the force by the mass to get acceleration, and then multiplying the acceleration by time. Speed = acceleration x time.
That is just not true! If you can calculate its average speed you should be able to calculate its speed at any point in time during its flight, including its final velocity.
You can use a graph to calculate speed.
To calculate force when given speed, you would need to know the mass of the object. The equation that relates force, speed, and mass is F = m*a, where F is the force, m is the mass, and a is the acceleration (change in speed over time). Without knowing the mass or acceleration, it is not possible to calculate the force.
You could measure the time it takes the toy car to travel a known distance down the ramp. Then, you can calculate the speed by dividing the distance traveled by the time taken. Alternatively, you could use a speed-measuring device such as a radar gun to measure the toy car's speed as it moves down the ramp.