Question

A particle X moving with a constant velocity u crosses a point 0. At the same instant another particle F
starts from rest from O with a constant acceleration a. The maximum separation between them before they
meet is
(a) u /2a
(b) ula
2u/a
(d) u²/4a​

Answer 1

Answer:

(a)  $\frac{u}{2a}$ is right.

Explanation:

maximum distance will be when both of them have same velocity because after that point of time velocity of particle F will be more then that of particle x so distance between then starts decreasing.

$t=\frac{u}{a}$

distance covered by X till this time is  $S_{1} =u*\frac{u}{a}$

distance covered by F till that time is  $S_{2} =\frac{1}{2}a \frac{u^2}{a^{2} }= \frac{u^{2} }{2a}$

maximum distance between them $S_{1} -S_{2} =\frac{u^{2} }{2a}$

so option A is correct.  

Answer 2

Heya!!

Here is your answer⬇️⬇️

A particle X moving with constant velocity u crosses a point O. At the same instant another particle F starts from rest from O with a constant acceleration.

The maximum separation between them before they are u/2a.

Hope this helps you❤