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What is the earliest point in the universe that we can observe? why can’t we see back further than this?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.