Angled Projectiles

Two arrows are launched at the same time with the same speed. Arrow A at an angle greater than 45 degrees, and arrow B at an angle less than 45 degrees. Both land at the same spot on the ground. Which arrow arrives first?

• arrow B arrives first

• arrow A arrives first

• it depends on the initial speed

• they both arrive together

A student rolls a coin off of a high horizontal platform, in a projectile experiment. The coin moves 20 centimeters horizontally (while also falling down) during the 1st second of its projectile motion. How far will the coin move horizontally during the 2nd second of its projectile motion?

• 40 cm

• 80 cm

• 20 cm

• 10 cm

A projectile is fired horizontally from a height of 20 meters above the ground, with an initial velocity of 7.0 m/s. How far does the projectile travel horizontally before it reaches the ground?

• 3.5 m

• 7 m

• 14 m

• 20 m

• 140 m

A group of students wish to determine the launch speed of a specific 'launcher' device that they are using in a projectile experiment. The group is using the launcher to launch a ball horizontally from the top of their lab table, to land on the floor below. The group has already measured the height of the table, relative to the floor below. Which one of the following sets of additional measurements would be adequate to allow the group to determine the ball's launch speed, without taking any extraneous/unnecessary measurements?

• Only the horizontal distance moved by the ball during its motion.

• The horizontal distance moved by the ball during its motion, as well as the time the ball falls

• The time the ball falls for, as well as the mass of the ball.

• Only the horizontal distance moved by the ball during its

  The horizontal distance moved by the ball during its motion, the time the ball falls for, and also the mass of the ball.

In a lab experiment, a ball is rolled down a ramp so that it leaves the edge of the table with a horizontal velocity v. If the table has a height h above the ground, how far away from the edge of the table, a distance x, does the ball land? You may neglect air friction in this problem.

• none of these

A diver moving horizontally with speed v dives from a cliff that is y meters high and lands a distance d from the base of the cliff. How far from the base of the cliff would the diver land, still going speed v, if the cliff were 4y meters high?

• ½ d meters from the base

• d meters from the base

• 2 d meters from the base

• 4 d meters from the base

• Cannot be determined

An object is thrown upwards with a velocity of 30 m/s near the surface of the earth. After two seconds what would be the direction of the vertical displacement, velocity and acceleration?

• A

• B

• C

• D

An arrow is aimed horizontally, directly at the center of a target 20 m away. The arrow hits 0.05 m below the center of the target. Neglecting air resistance, what was the initial speed of the arrow?

• 20 m/s

• 40 m/s

• 100 m/s

• 200 m/s

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground.Which of the following diagrams best shows the direction of the acceleration of the ball at point P?

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A projectile is fired with initial velocity vo at an angle θ with the horizontal and follows the trajectory shown above. Which of the following pairs of graphs best represents the vertical components of the velocity and acceleration. v and a, respectively, of the projectile as functions of time t?

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