Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

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

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

Grade:11

2 Answers

AKASH GOYAL AskiitiansExpert-IITD
419 Points
10 years ago

Dear Deepak

see the pic for the solution

All the best.

AKASH GOYAL

AskiitiansExpert-IITD

 

Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..

765_23499_Photo-0127.jpg

vikas askiitian expert
509 Points
10 years ago

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

 

 

 

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free