AnswersDISD CR Physics 2020-2021Projectile Motion

Lesson 4: Projectile Motion Answers

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Lexy throws a dart with an initial velocity of 25 m/s at an angle of 60° relative to the ground. What is the approximate vertical component of the initial velocity?

A
0.5 m/s
B
0.87 m/s
C
12.5 m/s
D
21.7 m/s
2
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A
diagonal
B
parabolic
C
perpendicular
D
tangential
3

best

T
The horizontal velocity of projectile X is changing, and the vertical velocity of projectile Y is constant.
T
The vertical velocity of projectile Y is changing, and the horizontal velocity of projectile X is constant.
T
The horizontal acceleration of projectile X is –9.8 m/s2, and the vertical acceleration of projectile Y is 0 m/s2.
T
The horizontal acceleration of projectile Y is –9.8 m/s2, and the vertical acceleration of projectile Y is 0 m/s2.
4

Barry is conducting an experiment and rolls a tennis ball down a ramp. Which best describes the motion of the tennis ball?

A
It does not exhibit projectile motion and follows a straight path down the ramp.
B
It does not exhibit projectile motion and follows a parabolic path down the ramp.
C
It exhibits projectile motion and follows a straight path down the ramp.
D
It exhibits projectile motion and follows a parabolic path down the ramp.
5

The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of which function(s)?

A
tangent only
B
cosine only
C
sine and tangent
D
cosine and sine
6

Projectile motion is a combination of which two types of motion?

A
parabolic and curved
B
straight and diagonal
C
horizontal and vertical
D
constant and linear
9

A basketball rolls off a deck that is 3.2 m from the pavement. The basketball lands 0.75 m from the edge of the deck. How fast was the basketball rolling?Seema lists the given values in a chart and determines that the unknown value is vx.

Question illustration
A
The y and x values are switched.
Option A
B
The unknown is , not vx.
Option B
C
The value for ay is not known.
D
The value of y should be –3.2 m.
Option D

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Lesson 4: Projectile Motion Answers — DISD CR…