Question

A train is moving with a velocity v. It's relative velocity with respect to the passenger I side the train
1.) zero
2.) v
3.) -v
4.) v/2
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Answer 1

Relative acceleration of car with respect to the bus is 4−2=2m/s
2

Now initial distance is 200m
as the Bus is taken as reference so it can be treated as rest
So the situation is like this , $$\text{ A car with acceleration 2m/s^2 is approaching a stationary bus at a distance 200 m}$$
So we can use s=at
2
/2 because initial velocity is zero.

So time t=
2

2s/a
​
=14.14second
We have used s=200meter.
Option C is correct.