16. A bullet is fired straight down from a hovering helicopter. If we neglect ai
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16. A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the velocity of the bullet:
A. is a constant.
B. increases at 9.8 m/s each second.
C. is zero.
D. decreases at 9.8 ft/s during the flight.
17. After 1 second, a ball dropped from rest will have fallen:
A. 2.45 m.
B. 9.8 m.
C. 4.9 m.
D. 19.6 m.
E. 1.0 m.
18. A ball is allowed to drop from rest. After 1 second its velocity will be:
A. 4.9 m/s.
B. 9.8 m/s.
C. 1.0 m/s.
D. 2.45 m/s.
E. 7.35 m/s.
19.
The diagram shows the positions at intervals of 0.10 seconds of a ball moving from left to right (as in a photograph taken with a stroboscope that flashes every tenth of a second).
20. A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball which hits the ground at the base of the cliff with the greater speed is the one initially thrown:
A. downward.
B. upward.
C. both hit with the same speed.
A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the velocity of the bullet: is a constant. increases at 9.8 m/s each second. is zero. decreases at 9.8 ft/s during the flight. After 1 second, a ball dropped from rest will have fallen: 2.45 m. 9.8 m. 4.9 m. 19.6 m. 1.0 m. A ball is allowed to drop from rest. After 1 second its velocity will be: 4.9 m/s. 9.8 m/s. 1.0 m/s. 2.45 m/s. 7.35 m/s. The diagram shows the positions at intervals of 0.10 seconds of a ball moving from left to right (as in a photograph taken with a stroboscope that flashes every tenth of a second).Explanation / Answer
B
C
B
No because the distance remains constant
Upward
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