In the absence of air resistance, an object dropped near the surface of the eart

Question

In the absence of air resistance, an object dropped near the surface of the eart experiences a constant acceleration of about 9.8 m/s2. This means that...

a. speed of teh object increases 9.8 m/s during each second

b. speed of teh object as it falls is 9.8 m/s

c. object falls 9.8 m during each second

d. object falls 9.8 m during the first second only

e. rate of change of the displacement with respect to time for the object equals 9.8 m/s2

2. A child tosses a ball directly upward. Its total time in the air is T. Its maximum height is H. What is its height after it has been in the air at time T/2?

a. H/4

b. H/3

c. H/2

d. 3H/4

e. H

At a certain time, an object in free fall has velocity 4.0 m/s in the upward direction. What is the approximate velocity of teh object one second later?

a. 14 m/s up

b. 10 m/s up

c. 4.0 m/s up

d. 6.0 m/s down

e. 10 m/s down

Explanation / Answer

1.d. object falls 9.8 m during the first second only

2.c. H/2

3.e. 10 m/s down

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