Two cars drive down the highway. the lead car has a constant velocity of 72 km/hr and is 50 km head of the trailing car that's going 80 km/hr. how much time does the trailing car need to catch up ?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

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.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?