An object falls from rest on a planet where the acceleration due to gravity is 20 m/s/s. At 5 seconds the object will have a speed of
Answers
Answer:
gravity is 20 m/s/s, then its speed reading would increase ... m/s. 5) An object falls freely from rest on a planet where the ... After 5 seconds, the object will have a speed of.
Explanation:
Physics Review Series I Multiple Choice Part 2 Section:______ Name_______________________________
MULTIPLE CHOICE. Choose the one alternative that best
completes the statement or answers the question.
1) If a freely falling object were somehow equipped with a
speedometer on a planet where the acceleration due to
gravity is 20 m/s/s, then its speed reading would increase
each second by
A) 40 m/s.
B) 20 m/s.
C) 30 m/s.
D) 10 m/s.
E) depends on its initial speed
2) A ball is thrown upwards and returns to the same
position. Compared with its original speed after release,
its speed when it returns is about
A) the same.
B) half as much.
C) four times as much.
D) twice as much.
3) An object covers a distance of 8 meters in the first
second of travel, another 8 meters during the next
second, and 8 meters again during the third second. Its
acceleration in meters per second per second is
approximately
A) 24. B) 5. C) 0. D) 8.
4) At one instant an object in free fall is moving downward
at 50 meters per second. One second later its speed
should be about
A) 55 m/s.
B) 50 m/s.
C) 25 m/s.
D) 60 m/s.
E) 100 m/s.
5) An object falls freely from rest on a planet where the
acceleration due to gravity is twice as much as it is on
Earth. In the first 5 seconds it falls a distance of
A) 150 m.
B) 500 m.
C) 100 m.
D) 250 m.
E) none of these
6) An apple falls from a tree and hits the ground 5 meters
below. It hits the ground with a speed of about
A) 5 m/s.
B) 15 m/s.
C) 20 m/s.
D) 10 m/s.
E) not enough information given to estimate
7) One half second after starting from rest, a freely falling
object will have a speed of about
A) 5 m/s.
B) 10 m/s.
C) 2.5 m/s.
D) 20 m/s.
E) none of these
8) Disregarding air resistance, objects fall with constant
A) velocity.
B) speed.
C) distances each successive second.
D) acceleration.
9) An object falls freely from rest on a planet where the
acceleration due to gravity is 20 meters per second
squared. After 5 seconds, the object will have a speed of
A) 50 m/s.
B) 5 m/s.
C) 100 m/s.
D) 10 m/s.
E) 20 m/s.
10) It takes 6 seconds for a stone to fall to the bottom of a
mine shaft. How deep is the shaft?
A) about 120 m B) about 180 m
C) about 60 m D) more than 200 m
11) If a projectile is fired straight up at a speed of 10 m/s,
the total time to return to its starting position is about
A) 2 seconds.
B) 20 seconds.
C) 10 seconds.
D) 1 second.
E) not enough information to estimate
12) Disregarding air drag, how fast must you toss a ball
straight up in order for it to take 2 seconds to return to
the level from which you tossed it?
A) 7.5 m/s
B) 5 m/s
C) 10 m/s
D) 20 m/s
E) 15 m/s
13) A car accelerates at 2 meters per second per second.
Assuming the car starts from rest, how much time does it
need to accelerate to a speed of 30 m/s?
A) 30 seconds
B) 15 seconds
C) 2 seconds
D) 60 seconds
E) n