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A soccer ball is kicked into the air with an initial speed of 20 m/s and returns to ground level. At which angle above the horizontal should it be kicked in order for it to travel the greatest range? (Neglect friction.)
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
An archer uses a bow to fire two arrows with the same force. One arrow is fired at 60° with the horizontal, and the other is fired at 45° with the horizontal. Compared to the arrow fired at 60°, the arrow fired at 45° has a
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 meters per second. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch?
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
A ball is thrown with an initial speed of 10. meters per second. At what angle above the horizontal should the ball be thrown to reach the greatest height?
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
A 0.2 kg red ball is thrown horizontally at a speed of 4 m/s from a height of 3 m. A 0.4 kg green ball is thrown horizontally from the same height at a speed of 8 m/s. Compared to the flight time of the red ball, the flight time of the green ball is
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
A projectile is launched with an initial speed v at a launch angle of 30° above the ground. It lands on the ground 2 s later. How does the maximum height of the projectile change as the launch angle is increased from 30° to 45° above the horizontal?
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
A golf ball is hit at an angle of 45° above the horizontal. What is the acceleration of the golf ball at the highest point in its trajectory? Neglect friction.
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
Two spheres are simultaneously projected horizontally from the top of a tower. Sphere A has a horizontal speed of 40 m/s and sphere B has a horizontal speed of 20 m/s. Which statement best describes the landing time and range? (Neglect friction.)
shorter flight time and longer horizontal range
Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.
increase the launch angle and increase the ball’s initial speed
90°
45°
9.8 m/s^2 downward
the same
The projectile's maximum height will increase
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