A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to the victim with an initial vertically downward velocity of 1.40 m/s and observes that it takes 1.80 s to reach the water. How high above the water was the preserver released?
Suppose that a person takes 0.35 s to react and move his hand to catch an object he has dropped. Assume that acceleration due to gravity on Earth is 9.8 m/s2.
How far does the object fall on Earth?
How far does the object fall on the Moon, where the acceleration due to gravity is one sixth of that on Earth?
A very strong, but inept, shot putter puts the shot straight up vertically with an initial velocity of 11.0 m/s. How much time does he have to get out of the way of the shot if it was released at a height of 2.20 m and he is 1.80 m tall?
Standing at the base of one of the cliffs of Mt. Arapiles in Victoria, Australia, a 1.60-m tall hiker hears a rock break loose directly overhead. The rock breaks loose 132 m above the ground. The hiker sees the rock 1.10 s after it breaks away.
How far above the hiker is the rock when he sees it?
How much time does he have to move before the rock hits his head?
A basketball referee tosses the ball straight up for the starting tip-off. With what vertical upward speed must a basketball player leave the ground to rise 1.44 m above the floor in an attempt to get the ball?