You have not considered all the forces here.
The road exerts frictional force due to which horse moves forward along the cart and frictional force is also exerted on the cart .
Now both have the same acceleration because friction is a self adjustable force
Our eyes contain cells called cone cells , these are of different types .
Some are sensitive to red color , some to blue and some to green . When a we see a banana the yellow light reflecting from it reaches our eyes and that yellow light is perceived by the different cone cells and the...