1. What is the total distance of the object from the ground when it is at the starting point? (t=0 s) 2. What happens to the object’s distance from the ground as it falls?

When throwing a ball straight up, which of the following are correct about the magnitudes of its velocity, v, and its acceleration, a, at the highest point in its path?       a. v = 0 and a = 0   b. v and a are both at their maximum values   c. v is not zero and a = -9.8 m/s2   d. v = 0 and a = -9.8 m/s2   e. v is not zero and a = 0

1 Standing on the roof of a 74-m tall building, a girl holds her hand past the edge and throws a ball straight up at 9.8 m/s. The ball rises, then falls and strikes the ground. Considering "up" to be the positive direction, find the ball's velocity v when it is 45 m above the ground. Remember to include a "-" sign if the velocity is negative. U V= m/s Record your numerical answer below, assuming three significant figures.

A search and rescue helicopter travels at constant speed in a horizontal plane. The figure below shows a portion of the path traveled by the helicopter, as viewed looking down from above. The helicopter's path includes three straight portions between points "1" and "2", points "4" and "5", and points "7" and "8", each of which has a length of 4000 m, as shown in the figure. It takes the helicopter 2000 seconds to travel along each of these straight portions of its path. The semi-circular portions of the path (also shown in the figure) have the same radius R=500m. +y YNorth) 8. 4 4000 m A semi-circle is one half of a circle. East 6.