Q. A ranger in a national park is driving at 39 km/h when a deer jumps onto the road 67 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -3.00 m/s2. What is the maximum reaction time allowed if the ranger is to avoid hitting the deer?

Q. A diver springs upward with an initial speed of 1.9 m/s from a 4.5 m board.

Find the velocity with which he strikes the water. (Hint: When the diver reaches the water, his displacement is y = -4.5 m (measured from the board), assuming that the downward direction is chosen as the negative direction.)