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Deepak Sharma Grade: 11
        

7. A boy throws a table tennis ball of mass 20 g upwards with a velocity of u 0 = 10 m/s at an angle q 0 with


the vertical. The wind imparts a horizontal force of 0.08 N, so that the ball returns to the starting point.


Then, the angle q 0 must be such that, tan q 0 is


(A) 0.2 (B) 0.4 (C) 2.5 (D) 1.2

6 years ago

Answers : (2)

AKASH GOYAL AskiitiansExpert-IITD
419 Points
										

Dear Deepak


see the pic for the solution


All the best.


AKASH GOYAL


AskiitiansExpert-IITD


 


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765_23499_Photo-0127.jpg

6 years ago
vikas askiitian expert
510 Points
										

for verticle motion


 Uy = U0COS@   &   ay = -g


 applying  VY = UY + ayt


    Vy at topmost point is zero so


 t= uy/g


tim of flight (T)= 2t=2Uy/g .........1


for horizontal motion


Ux = UOCOS@


 Sx = UxT + axT2


finally particle reaches to same point so displacement  is zero ..


 0 = UxT + axT2/2    .........2


putting value of T in eq 2


Uy/Ux = g/a  .........3


max = force =0.08


ax = 4m/s2


now , UY/UX = Uocos@/Uosin@


                       =tan@=10/4=2.5


option c is correct


 


 


 

6 years ago
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