Multiple Choice Use a Scantron form to submit the answer choice that best comple
ID: 1877914 • Letter: M
Question
Multiple Choice Use a Scantron form to submit the answer choice that best completes the statement or answers each question 1. A bird, accelerating from rest at a constant rate, experiences a displacement of 34 m in 12 s. What is the average velocity? A. 3.6 m/s B. 0.4 m/s C. 1.8 m/s D. 2.8 m/s E. 0 m/s 2. On a position versus time graph, the slope of the straight line joining two points on the plotted curve that are separated in time by the interval At, is which of the following quantities? A. average steepness B. average acceleration C. instantaneous velocity D. average velocity 3. Anx vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and atr 5s the velocity of the ball is zero. We can be positive that at A. the acceleration is constant. B. the ball has stopped. C. the curve is at x- 0,-0 D. the slope of the curve is non-zero. 5 s, -4. Jeff throws a ball straight up. For which situation is the vertical velocity zero? A. on the way back down B. on the way up C. at the top D. none of the above ght Cengage Leaming. Powered by CogneroExplanation / Answer
1.D
Given the bird accelerating from rest experiences a displacement of 34 min in 12 s
the average velocity of the bird is V_avg = 34/12 m/s = 2.833 m/s
Answer is option D
2.D
on a position vs time graph , the slope of the straight line joining two points on the plotted curve give the average velocity
the slope of the curve is velocity between two points is average velocity
answer is option D
3.B
The ball starts at origin and at t=5s , velocity became zero means the slope is zero so the answer is the ball has stopped
4. C
when a ball thrown vertically upwards , the velocity of the ball (vertical motion only so horizontal velocity is zero )become zero at the top only
as the gravitational force acts downward so it reaches to a certain height only at the top the velocity become zero, form there the ball move downward
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