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# 4. Runner A is initially 3.0 km west of a flagpole and is running with a constant…continues

4. Runner A is initially 3.0 km west of a flagpole and is running with a constant velocity of 5.5 km/h due east. Runner B is initially 4.0 km east of the flagpole andis running with a constant velocity of 6.5 km/h due west. How far are the runners from the flagpole when their paths cross?

___ km

6.

A physics student throws a softball straight up into the air. The ball was in the air for a total of 3.36 s before it was caught at its original position. How high didit rise? ___ m

7.

A tennis ball with a velocity of 10.0 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with avelocity of -8 m/s to the left. If the ball is in contact with the wall for 0.010 s, what is the average acceleration of the ball while it is in contact with thewall?

___ m/s^2