Q2. Two cars are travelling towards each other at speed of $20 \mathrm {~m} \mathrm {~s} ^ { - 1 }$ each. When the cars are 300 m apart, both the drivers apply brakes and the cars retard at the rate of $2 \mathrm {~m} \mathrm {~s} ^ { - 2 }$. The distance between them when they come to rest is :\\
(1) 200 m\\
(2) 100 m\\
(3) 50 m\\
(4) 25 m