1. Every morning, an athlete jog around a 400-m oval track six times in 30 minutes. What is the athlete’s (a) average speed and (b) average velocity? 2. A body moving with a constant acceleration in a straight line was first observed to be moving at 4.5 m/s. After 10 seconds, it was moving at 6.8 m/s. Find its acceleration.

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.