question_answer

To get the maximum flight a ball must be thrown as

A)  

B)  

C)  

D)  any of ,  and

Correct Answer: B

Solution :

                 If a ball is moving from left to right and also spinning about a horizontal axis in anti-clock wise direction of motion, then relative to the ball air will be moving from right to left. The resultant velocity of air above and below the ball will be\[(v+r\omega )\]and\[(v-r\omega )\]respectively. So, according to Bernoulli's principle, due to this difference of pressure an upward force will act on the ball and hence, the ball will deviate from its usual path OA and will hit the ground at B following path OB, ie, if a ball is thrown with back spin the pitch will curve less sharply prolonging the flight.