You stand at the top f a tall building with a stopwatch. you drop a rock off the side of the building, and it takes the rock 1.9 seconds to hit the ground (assume no time resistance)

a. how tall is the building?

b. how fast was the rock going when it hit the ground?

c. when you did your calculation for part (b), you assumed there was no air resistance. would your answer be larger, smaller, or the same if there were air resistance? explain.

a) h=1/2*gt^2=1/2*9.8*1.9^2=17.69 m

b) v=gt=18.62 m/s

c) Due to the air resistance (also called 'drag force') the speed would decrease since the net force (difference between force of gravity and drag force that attracts the body to the earth) becomes smaller.

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

when it gains or loses electrons