here are all the answers
1. Which example identifies a change in motion that produces acceleration?
(0 pts) a speed skater moving at a constant speed on a straight track
(1 pt) a ball moving at a constant speed around a circular track
(0 pts) a particle moving in a vacuum at constant velocity
(0 pts) a vehicle moving down the street at a steady speed
2. Objects in free fall near the surface of Earth experience (1 point)
(0 pts) constant speed.
(0 pts) constant velocity.
(1 pt) constant acceleration.
(0 pts) constant distance.
3. Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s. What is your acceleration?
(1 pt) 2 m/s²
(0 pts) 5 m/s²
(0 pts) 4 m/s²
(0 pts) 3 m/s²
4. The slope of a speed-time graph indicates (1 point)
(0 pts) direction.
(1 pt) acceleration.
(0 pts) velocity.
(0 pts) speed.
5. A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train’s acceleration be described?
(0 pts) The train’s acceleration is positive.
(0 pts) The train is not accelerating.
(0 pts) The train will come to rest in 6 minutes.
(1 pt) The train’s acceleration is negative.
6. What is a good definition of acceleration?
(0 pts) how fast a speed is changing at a specific instant
(1 pt) how fast a velocity is changing at a specific instant
(0 pts) how fast a direction is changing at a specific instant
(0 pts) each of the above
6/6 100% have a nice day ˋ( ° ▽、° )