A stone is dropped into a river from a bridge 43.9 m above the water. Another stone is thrown vertically down 1.00 s after the first is dropped. The stones strike the water at the same time. (a) What is the initial speed of the second stone? (b) Plot velocity versus time on a graph for each stone, taking zero time as the instant the first stone is released

A whale swims due east for a distance of 8.0 km in a time of 2.50 h. It then turns around and moves west for 2.0 km in a time of 0.50 h. It turns around again and heads 4.0 km due east in a time of 1.00 h. What is the total distance travelled by the whale. What is the total displacement? What is the average speed for the entire trip? What is the average velocity for the entire trip? There are five quantities discussed in this question: distance, displacement, time, speed, and velocity. Which of these are scalars and which are vectors?

A car has an initial velocity of 17.8 m/s (SOUTH). The car has an unknown acceleration for a time of 7.11 seconds, at which point the car has a final velocity of 4.20 m/s (NORTH). During this time what is the car's displacement?

A lead ball is dropped into a lake from a diving board 6.20 m above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 4.80 s after it is released. How deep is the lake?