1)if at a moment t=0,the separation between two cars is 100m,the separation between the at t=2s2)Twocars start from the same - Physics - Motion In A Straight Line

Question

1)if at a moment t=0,the separation between two cars is 100m,the
separation between the at t=2s2)Twocars start from the same point
on a straight road due north While carA starts with initial
velocity 10m/s and a=1m/s^2,carB starts from rest and has an
acceleration of 2m/s^2 answer the question 1)the moment of time at
which the separation of the cars is same as that of t=5s is?

Jyoti Pant · Accepted Answer

1) Data seems to be incomplete to solve the question Kindly recheck
it and then post again
2)
Given that,
uA=10 m/s, aA=1 m/s2uB=0,aB=2m/s2Distance travelled by car in 5
seconds,sA=uAt+12aAt2=10×5+12×1×52=62 5 mand
sB=uBt+12aBt2=0+12×2×52=25 mSeparation between the
cars=sA-sB=62 5-25=37 5 mSuppose after time t', the separation is
again 37 5 mSo, sA-sB=(uAt'+12aAt'2)-(uBt'+12aBt'2)37
5=(10t'+121×t'2)-(0+12×2×t'2)On solving,we get
t'=15
Thus,
After 15 seconds, 
the separation of the cars is same as that of t=5s