According to the nebular theory, what is the explanation as to why the terrestrial planets formed in the inner solar system and the jovian planets formed in the outer solar system?
a. the denser terrestrial planets sank inward towards the sun through the nebular cloud, but the less dense jovian planets did not sink through the nebular cloud.
b. all of the planets formed at a large distance from the sun but the dense terrestrial planets experienced a larger pull of the sun's gravity and were drawn into orbits that are closer to the sun then the jovian planets.
c. ices condensed in the outer solar system and some icy planetesimals grew large enough to attract gas from the nebula, but only metals and rock condensed in the inner solar system.
d. all of the planets were initially about the same size but the planets closer to the sun have had much of their material evaporated because they are warmer than the outer planets.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

option number c is the right answer.