Answer:
0
Explanation:
The displacement is zero since it goes in a full circle and ends up where it started.
Scenes the chair wheels are up the person is rolling backwards and if the wheels were down then the person would go forwards
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card games
board games
bird watch
write a song
make a game
count stuff
throw a ball with someone
play outside
Answer:
7.328m/s
Explanation:
Given parameters:
height of table = 0.68m
final velocity of the ball = 6m/s
Unknown:
Initial velocity of ball = ?
Solution:
To solve this problem, we are going to employ the appropriate motion equation.
We must understand that this fall occurs in the presence of gravity;
V = U + 2gH
Where;
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity
H is the height of the pool table
Since U is the unknown, let us make it the subject of the expression;
U = V - 2gH
U = 6 - (2 x 9.8 x 0.68) = 7.328m/s(deceleration)
A. The average force exerted on the ball during the serve is 57 N
B. The resistive force, given the data is -1125 N
<h3>A. How to determine the average force</h3>
- Mass (m) = 57 g = 57 / 1000 = 0.057 Kg
- Initial velocity (u) = 50 m/s
- Time (t) = 0.05 s
- Acceleration (a) = u / t = 50 / 0.05 = 1000 m/s²
- Force (F) = ?
F = ma
F = 0.057 × 1000
F = 57 N
<h3>B. How to determine the resistive force</h3>
- Mass (m) = 3000 Kg
- Initial velocity (u) = 72 Km/h = 72 / 3.6 = 20 m/s
- Final velocity (v) = 18 Km/h = 18 / 3.6 = 5 m/s
- Time (t) = 40 s
- Force (F) = ?
F = m(v – u) / t
F = 3000(5 – 20) / 40
F = -1125 N
Learn more about momentum:
brainly.com/question/250648
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