Tara goes kayaking at sunrise. She rows 50 feet in 20 seconds. She transfers 100 joules of energy. What is Tara's power?
5 W
10 W
50 W
2W

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.