My best guess is A There is missing a time unit in the question. I know that 4.4 *5 = 21 so that would be my best guess.
Ek - kinetic energy
v2 - unknown speed
v1 - 40 m/s (initial speed)
Ek=1/2 mv^2
Ek in half way up is 1/2 Ek (with another V)
So, Ek in the beginning is Ek1= 1/2 mv1^2
and in half way Ek2=1/2 mv2^2
Ek1=2*Ek2
1/2 mv1^2 = 2* 1/2 mv2^2
1/2 v1^2 = v2^2
1/2 40^2 = v2^2
800 = v2^2
v2 = sqrt (800) = 28,3 m/s
You're thinking of Kepler's first law of planetary motion, but that's not
what it says.
First of all, Kepler didn't say anything about gravity. He only described
the orbits. And he said that the orbit of each planet is an <u>ellipse</u>, with the
sun at one focus.
If by some chance you're thinking of Newton ... he showed that <u>if</u> his formula for
gravity is correct, then the orbit of a planet <u>must</u> be an ellipse. But Newton's law
of gravity is not one of his so-called "three laws of motion".
Answer:
29.39 kg
Explanation:
From the question,
W = mg...................... Equation 1
Where W = weight of the cuboid box, m = mass of the cuboid box, g = acceleration due to gravity.
make m the subject of the equation
m = W/g.................. Equation 2
Given: W = 288 N
Constant: g = 9.8 m/s²
Substitute these values into equation 2
m = 288/9.8
m = 29.39 kg
Answer:
The answer is "c,d,e, and g".
Explanation:
The correct choices can be defined as follows:
- Higher-frequency microwaves aren't used in any of these systems.
- Infrared waves aren't seen in each of these technologies.
- Its shortest wavelength of all of the technologies listed is the above radiation generated by certain wireless networks.
- These devices all produce waves of wavelengths ranging from 0.10 to 10.0 cm.
