A car travelled 60 km east in 1.33 h along a straight line, then returned back west for 40 km in 0.67 h. Its average velocity

10 Km/h east

Explanation:

Average Velocity

The velocity measures the displacement an object has in a given interval of time. It doesn't take into consideration the distances traveled, unlike the speed that measures the distance over time.

The car traveled 60 Km east in 1.33 h. Then it returned back west for 40 Km in 0.67 h.

As mentioned, the velocity only considers the total displacement of the object. Given the car went 60 km east and then went back 40 km, its total displacement is 60 - 40 = 20 km east.

The total time the car took to travel forth and back is 1.33 h + 0.67 H = 2 h.

Since the velocity is the ratio of displacement by time:

The direction of the average velocity is due east

c) up is the direction the magnetic force is acting on the charge.