A car moving along a straight highway with a speed of \(126\) km/h is brought to a stop within a distance of \(200\) m. How long does it take for the car to stop?
1. \(10.2\) s
2. \(9.6\) s
3. \(11.4\) s
4. \(6.7\) s

Two trains A and B of length \(400\) m each are moving on two parallel tracks with a uniform speed of \(72\) km/h in the same direction with A ahead of B. The driver of B decides to overtake A and accelerates by \(1\) m/s². If after \(50\) s, the guard of B just brushes past the driver of A, what was the original distance between them?
1. \(2000\) m
2. \(2250\) m
3. \(1200\) m
4. \(1250\) m

On a two-lane road, car A is travelling at a speed of \(36\) kmh^-1. Two cars B and C approach car A in opposite directions with a speed of \(54\) kmh^-1 each. At a certain instant, when the distance AB is equal to AC, both being \(1\) km, B decides to overtake A before C does. What minimum acceleration of car B is required to avoid an accident?
1. \(1\) ms^-2
2. \(5\) ms^-2
3. \(2\) ms^-2
4. \(3\) ms^-2

A player throws a ball upwards with an initial speed of $29.4 m s^{-1}$. What is the direction of acceleration during the upward motion of the ball?

A boy standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to $49$ $m$ $s^{-1}.$  How much time does the ball take to return to his hands? 
1. 5 s
2. 10 s
3. 15 s
4. 7 s