Answer:
.5(3120kg)(22.1m/s)^2 = 7.62x10^5 J
Explanation:
Answer:

Explanation:
velocity of ball in train reference = v2
velocity of ball in earth reference = v1+v2
(a)
Kinetic energy is given by
where m and v are the mass and velocity of object respectively.
Change in kinetic energy is given by subtracting initial kinetic energy from the final kinetic energy. In this case
Initial kinetic energy= 
Final kinetic energy= 
Change in kinetic energy=
(b)
Change in velocity in train reference will be
Initial kinetic energy= 
Final kinetic energy= 
Change in kinetic energy=
(c)
Work done, W = change in kinetic energy=
(d)
Work done, W = change in kinetic energy=
Yes. It's approximately the same, but not exactly.
The weight of an object 7 miles above the Earth's surface (the gravitational force on it) is about 0.35% less than it is down on the surface.
Answer:
Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy.
Explanation: