Question:
1. A car has an initial speed of 15 ms-1 when a truck rolls out of a driveway 18 m ahead of it. The driver takes 0.35 s to react before applying the brakes. If the car is to just be able to stop before hitting the truck the deceleration of the car will be nearest to:
2. A rock is thrown vertically upwards with a velocity of 30 m.s-1 from the top of a 25 m high building. When it falls back down it just misses the building and falls to the ground. The acceleration due to gravity is 9.8 m.s-2. Find the nearest total time of flight of the rock