An 8.0-newton wooden block slides across a
horizontal wooden floor at constant velocity.
what is the magnitude of the force of kinetic
friction between the block and the floor?
(1) 2.4 n (3) 8.0 n
(2) 3.4 n (4) 27 n

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.