Friction the motion of an
object.
A. opposes
B. does typt affect
C. increases
D. speeds up

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

1. what is the si unit of emf? 2.a complete series circuit consists of a 12.0 v battery, a 4.70 ω resistor, and a switch in the closed position. the internal resistance of the battery is 0.30 ω. what does an ideal voltmeter read when placed across the resistor?