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Grade: 11
        

a car is moving with high velocity suddenly a wall appears to driver of car, in this case what he should do,


 


i)  go forward and apply brakes as hard as he can


ii)  take sharp turn without touching brakes


iii)  take turn with brakes applied hard


iv)   simply close his eyes and pray to god


                 plz give reason for each statements for why n why not ..   i"ll surely approve

8 years ago

Answers : (5)

iit jee
44 Points
							

hi,

i think he should choose option i),

becoz if he goes according to option ii) and iii) then backside of the car would hit the wall.....................

8 years ago
SAGAR SINGH - IIT DELHI
879 Points
							

Dear student,

Yes definitely the correct option is i)

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

8 years ago
Sanika Phatak
16 Points
							

If the man takes a sharp turn the car will move in a circular path but as it has a high velocity by the formula acc=v^2/R the radius will be large so there is a huge possibility that he will crash.

  Even if he applys brakes and takes a sharp turn it is  the same as above as the acc cant exceed v^2.

If he only applys brakes hard enough, he will stop so option 1 is correct.

 

Please approve if correct!!

8 years ago
Tejas Paresh Lodaya
33 Points
							

i) is the correct ans.

1/2mv2=Fx ;x=mv2/2F ;The collision would be avoided if x<_r.

or mv2<_r or F>_mv2/2r. Again ,F=mv2/R or R=mv2/F;

R<_r, F>_MV2/r.

Clearly less force will be involved when brakes are applied.

Plz approve...

8 years ago
dewansh parashar
4 Points
							

hi,

i think option 3 is correct.....taking the turn will divert the kinetic energy a bit and applying breaks will avoid his head on collision ,also as frictional force increases on increase in sur.area of body,the frictional force will be more against the velocity if the car moves sideways...

hope my logic is correct....and it helps u...

just a mere guess...

thanku

8 years ago
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