If a 2 kg ball is traveling at 4 meters per second, what is its kinetic energy?
2 answers:
Answer:
General Formulas and Concepts:
<u>Energy</u>
Kinetic Energy Formula:
- <em>KE</em> is in J
- <em>m</em> is in kg
- <em>v</em> is in m/s
Explanation:
<u>Step 1: Define</u>
<em>Identify variables</em>
<em>m</em> = 2 kg
<em>v</em> = 4 m/s
<u>Step 2: Find KE</u>
- Substitute in variables [Kinetic Energy Formula]:
- Simplify:
Topic: AP Physics 1 - Algebra Based
Unit: Energy
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Average speed is defined as total distance moved in total interval of time
so it is given as
now here is we show distance by "d" and time by"t"
then we will have mathematical expression as follows
Answer:
Work
Explanation:
Units are
Answer:
18.47 s
Explanation:
Given:
Speed of the opponent, u₁ = 2 m/s
Time after which player starts = 2 seconds
Thus,
distance covered (s₁) by the opponent before the player starts = u₁ × 2
= 2 × 2 = 4 m
let 't' seconds be the time taken by the player to catch the opponent
now,
the total distance covered by the player will be
= 4 m + distance traveled by the opponent in the time t
= 4 + ( 2 × t ) m
also,
From Newton's equation of motion the distance covered by the player
where,
s is the distance
u is the initial speed = 0 m/s as starting from rest
a is the acceleration = 0.24 m/s²
t is the time
on substituting the respective values, we get
also,
s₁ = s₂
thus,
or
4 + 2t = 0.12t²
or
0.12t² - 2t - 4 = 0
on solving the quadratic equation, we get
t = 18.47 s
[negative value of the roots is ignored as time cannot be negative]