Instantaneous Velocity And Air Resistance

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

A) always

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B) never

C) only when the velocity is constant

D) only when the acceleration is constant

E) only when the acceleration is changing at a constant rate

Group of answer choices

Two objects are thrown from the top of a tall building and experience no appreciable air resistance. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds just before they hit the street?

A) The one thrown up is traveling faster.

B) The one thrown down is traveling faster.

C) They are traveling at the same speed.

D) The one thrown up is traveling at its initial speed.

E) The one thrown down is traveling at its initial speed.

Group of answer choices

Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion?

A) In equal times its speed changes by equal amounts.

B) In equal times its velocity changes by equal amounts.

C) In equal times it moves equal distances.

D) A graph of its position as a function of time has a constant slope.

E) A graph of its velocity as a function of time is a horizontal line.

Group of answer choices

A runner maintains constant acceleration after starting from rest as she runs a distance of 60.0 m. The runner’s speed at the end of the 60.0 m is 9.00 m/s. How much time did it take the runner to complete the 60.0 m distance?

A) 6.67 s

B) 15.0 s

C) 9.80 s

D) 10.2 s

E) 13.3 s

Group of answer choices

A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward. What maximum elevation does the rocket reach? Ignore air resistance.

A) 487 m

B) 327 m

C) 320 m

D) 408 m

E) 160 m

Group of answer choices

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