A ball is thrown straight upward from the surface of Earth. Which statement best describes the ball’s velocity and acceleration at the top of its flight?

A projectile with mass m is fired with initial horizontal velocity v from height h above level ground. Which change would have resulted in a greater time of flight for the projectile? Neglect friction.

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.)

Without air resistance, a kicked ball would reach a maximum height of 6.7 meters and land 38 meters away. With air resistance, the ball would travel

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?

Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 m/s and stone B has an initial speed of 30 m/s. Compared to the time it takes stone A to land, the time it takes stone B to land is

A projectile launched at an angle of 45° above the horizontal travels through the air. Compared to the projectile’s theoretical path with no air friction, the actual trajectory of the projectile with air friction is

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.)

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 horizontal distance traveled change as the launch angle is increased from 30° to 45° above the horizontal?

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?

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?

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.

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

A ball thrown vertically upward reaches a maximum height of 30. meters above the surface of Earth. At its maximum height, the speed of the ball is

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

A 2-kilogram block is dropped from the roof of a tall building at the same time a 6-kilogram ball is thrown horizontally from the same height. Which statement best describes the motion of the block and the motion of the ball? (Neglect air friction.)

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