Answer:
17.15 m/s.
Explanation:
The following data were obtained from the question:
Maximum height (h) = 15 m
Final velocity (v) = 0 m/s
Acceleration due to gravity (g) = –9.8 m/s² (since the ball is going again gravity)
Initial velocity (u) =.?
The initial velocity with which the baseball pitcher threw the ball can be obtained as follow:
v² = u² + 2gh
0² = u² + (2 × –9.8 × 15)
0 = u² + (–294)
0 = u² – 294
Collect like terms
0 + 294 = u²
294 = u²
Take the square root of both side
u = √294
u = 17.15 m/s
Therefore, the baseball pitcher threw the ball with an initial velocity of 17.15 m/s
The effiency of a machine is
(output work or energy) / (input work or energy) .
For the system described in the question, that's
(123 J) / (150 J) = 0.82 = 82% .
I believe its B. it contains only the colors of the rainbow and TV waves
Hope it helped
Answer:
The correct option is
a. v = 
Explanation:
Time at which the object start fall t = 0
The acceleration a is given by a = g - bV
Where V = Speed of the object
Speed V² = u² + 2·a·h
However with the drag force the object will approach terminal velocity as t becomes progressively larger whereby v will stop increasing
Option a. is the only option that has limiting value of v which is in the range of g as t increases ∴ option a. is the correct option.
v =
as t increases
→ 1 s and v→ g/b m/s
Answer:


Explanation:
Given:
time of constant deceleration, 
A.
initial angular speed, 
<u>Using equation of motion:</u>



B.
Using eq. of motion for no. of revolutions, we have:


