First slide
Fluid dynamics
Question

Consider the following statements 
(A) As wind flows left to right and a ball is spinned as shown, there will be a lift of the ball.
(B) Decrease in velocity of air below the ball, increases  the pressure more than that above the ball. 
Select the correct option.
(a) (A) is false but (B) is true.
(b) Both (A) and (B) are true.
(c ) (A) is true but (B) is false.
(d) Both (A) and (B) are false.
 

Moderate
Solution

Due to pressure difference created the ball will be lifted up.

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