Answer:
first object final velocity =2m/s
second = 12m/s
Explanation:
i hope this will help you,..,
-- During the time the ball is flying from the high roof to the low roof,
it's going to fall (100-25) = 75 meters.
How long does it take an object dropped from rest to fall 75 meters ?
Distance = (1/2) · (gravity) · (time)²
75 m = (4.9 m/s²) · (time)²
Time² = (75 m) / (4.9 m/s²)
Time² = 15.31 sec²
Time = √(15.31 sec²) = 3.91 seconds
So the ball has to cover the horizontal distance of 20 meters
in 3.91 seconds.
Distance = (speed) · (time)
20 m = (speed) · (3.91 sec)
Speed = (20 m) / (3.91 sec)
Speed = 5.11 m/s
Age of dino: Mesozoic era
End of earth a dessert: End of the Mesozoic
a layer: Paleozoic
Answer: E = 39.54 N/C
Explanation: Electric field can be determined using surface charge density:

where:
σ is surface charge density
is permitivitty of free space (
)
Calculating resulting electric field:


![E = \frac{[0.3-(-0.4)].10^{-9}}{2.8.85.10^{-12}}](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7B%5B0.3-%28-0.4%29%5D.10%5E%7B-9%7D%7D%7B2.8.85.10%5E%7B-12%7D%7D)

E = 39.54
The resulting Electric Field at any point is 39.54N/C.
Answer:
It will take the person 10 seconds to run a 30-meter city block.
Explanation:
To solve this problem, we must remember the formula for velocity:
velocity = displacement/time
If we plug in the values that we are given, we get:
3 m/s = 30 m/time
We can see from the above equation that our answer should be in seconds, so we can get rid of the units to simplify the equation slightly.
3 = 30/t
Next, we can multiply both sides by t:
3t = 30
Then, we should divide both sides of the equation by 3 to get the variable t alone on the left side of the equation.
t = 10
Therefore, the correct answer is 10 s.