What happens when a penny is dropped from a height of 20 meters? O The force of gravity causes it to accelerate.
O It falls at a constant velocity.
O Its mass doubles for every second it falls.
O It changes direction every 9.8 meters.

#1.The force of gravity causes it to accelerate

Explanation:

As acceleration is the rate of change in velocity of an object with respect to time. ... The acceleration of penny is due to the force of gravity. Thus, we can conclude that the force of gravity causes it to accelerate.

c

explanation:

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.