Answer:
How big your foot is. (Big Brain)
Explanation:
Answer:
25.71 kgm/s
Explanation:
Let K₁ and K₂ be the initial and final kinetic energies of object A and v₁ and v₂ its initial and final speeds.
Given that K₂ = 0.7K₁
1/2mv₂² = 0.7(1/2mv₁²)
v₂ = √0.7v₁ = √0.7 × 20 m/s = ±16.73 m/s
Since A rebounds, its velocity = -16.73 m/s and its momentum change, p₂ = mΔv = m(v₂ - v₁) = 0.7 kg (-16.73 - 20) m/s = 0.7( -36.73) = -25.71 kgm/s.
Th magnitude of object A's momentum change is thus 25.71 kgm/s
Gravitational energy is the potential energy associated with gravitational force. If an object falls from one point to another inside a gravitational field, the force of gravity will do positive work on the object and the gravitational potential.
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Answer:
Amount of linear movement
Explanation:
Our system is defined by the rate of change in mass that
leaves the car
, this happens during a time interval
, in addition to freight car and sand at time t.
In this way we need to define the two states:
State 1,
consider
and V.
State 2,
consider 
In this state is the mass of sand output, which
is composed of

In this way we define the Linear movement in x, like this:



In this way we proceed to obtain the Force


Since the mass of the second term becomes 0, the same term is eliminated, thus,



Energy can only be converted from one form to another
eg kinetic energy is converted to heat energy