Question

>>only solve by use of relative motion<< Two objects moving along the same straight line are leaving point A with an acceleration a, 2a & velocity 2 u, u respectively at time t = 0. The distance moved by the object with respect to point A when one object overtakes the other is au2/a. Here a is an integer. Find a :

Answer 1

Answer:

Let both will meet at point B

x=2ut+1/2at

2

x=ut+

2

1

(2a)t

2

So 2ut+

2

1

at

2

=ut+at

2

ut=

2

1

at

2

⇒t=

a

2u

So x=2u(

a

2u

)+

2

1

a(

a

2u

)

2

=

a

6u

2

solution