A rock is dropped from 20 feet above the surface of the Earth. Which of the following is true? a. It falls because of the combined effects of gravity and air pushing downward upone it. b. It falls because of a natural tendency for rocks to rest upon the Earth c. It speeds up as it falls because of a nearly constant force of gravity acting on it. d. It speeds up as it falls because of an increasing force of gravity acting upon it. e. It quickly reaches a maximum speed, then falls at a constant rate.

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Q: Mars' gravitational pull is 0.376 that of the Earth's. What would a person of mass 91.2 kg weigh on…

A: Earth's gravitational pull = 9.8 m/s2 Mars' gravitational pull = 0.376 * 9.8 m/s2 = 3.688 m/s2

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A: Option b is correct answer  When it's closer to moon than to earth

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Q: A  7.4 -kg rock and a  8.0  × 10-4-kg pebble are held near the surface of the earth. (a) Determine…

A: Given: The mass of the rock is 7.4 kg. The mass of the pebble is 8x10-4 kg.

Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!