Guest

The relation between time t and distance x is t = ax^2 + bx, where a and b are positive constants. Its acceleration is?

The relation between time t and distance x is t = ax^2 + bx, where a and b are positive constants. Its acceleration is?

Grade:11

3 Answers

Badiuddin askIITians.ismu Expert
148 Points
14 years ago

Dear Vishrant

t = ax^2 + bx

differentiate w.r.t t

1= 2ax dx/dt + b dx/dt

1= (2ax+b)dx/dt

dx/dt = 1/(2ax+b)

again differentiate

d2x/dt2 = -1/(2ax+b)2  (2adx/dt)

 a= -1/(2ax+b)2   * 2a/(2ax+b)

 a = -2a/(2ax+b)3

Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you
the answer and detailed solution very quickly.

 We are all IITians and here to help you in your IIT JEE preparation.

 All the best.
 
Regards,
Askiitians Experts
Badiuddin



Samuel Garry
61 Points
5 years ago
So, if t = ax^2+bx
then, differentiate both side with respect to time (t) 
dt/dt = 2ax.dx/dt + b.dx/dt 
1 = 2axv + bv 
v.(2ax + b) = 1 
 (2ax + b) = 1/v 
Again differentiate both side with respect to time (t) 
2a.dx/dt = -v-2 . dv/dt 
 2av = -v-2 . acceleration 
acceleration = -2av3
Hence, retardation= -2av3
Yash Chourasiya
askIITians Faculty 256 Points
3 years ago
Dear Student

Please see the solution in the attachment.
Given
643-907_Untitled.png

I hope this answer will help you.
Thanks & Regards
Yash Chourasiya

Think You Can Provide A Better Answer ?

ASK QUESTION

Get your questions answered by the expert for free