Answer: h = 3R
Explanation:
Using the law of conservation of energy,
Total energy at the beginning of the launch would be equal to total energy at any point.
kinetic energy + gravitational potential energy = constant
Initial energy of the projectile =
... (1)
where R is the radius of the Earth, M is the mass ofthe Earth, m is the mass of the projectile.
escape velocity, 
Total energy at height h above the Earth where speed of the projectile is half the escape velocity:
...(2)
(1)=(2)
⇒
⇒
⇒
⇒
⇒h = 3R
Thus, at height equal to thrice radius of Earth, the speed of the projectile would reduce to half of escape velocity.
Answer:
78.4 J
Explanation:
The gravitational potential energy of an object is the energy possessed by the object due to its location in the gravitational field.
The change in gravitational potential energy of an object is given by:
where:
m is the mass of the object
is the acceleration due to gravity
is the change in height of the object
For the mass in this problem, we have:
m = 2 kg is the mass
is the change in height
So, its change in gravitational energy is:
Answer:
it is a sad day for rain to fall. Ill answer your question later
Explanation:
Action and reaction are equal in magnitude and opposite direction by they don't balance each other because they don't occur on the same body. Action is involved on one body and reaction is involved on another body.
Hope you understood...
