You have studied the relationships
between displacement, velocity, acceleration, and
time. You also learned what force is, and how it is
related to mass and acceleration. You have studied
circular and projectile motions as well.

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You should have a
piece of paper and a pencil with you.

Chapter 7 Quiz

1. A ball was dropped from a 30 m tall building.

a. What is the acceleration of the ball when t
= 1.0?

m/s^{2}

b. What is the velocity of the ball when t =
1.0?

m/s

c. What is the displacement of the ball when t
= 1.0?

m

d. How long will it take for the ball to hit
the ground?

s

2. A ball was dropped from a helicopter. The
helicopter was moving horizontally with a constant
velocity of 30 km/h (8.33 m/s) when the ball was
released.

a. What is the velocity of the ball on
x-direction when t = 2.0, assuming that the ball
has not hit the ground yet?

m/s

b. What is the displacement of the ball on
x-direction when t = 2.0, assuming that the ball
has not hit the ground yet?

m

c. What is the velocity of the ball when t =
2.0, assuming that the ball has not hit the
ground yet?

m/s

d. The ball hit the ground when t = 3.2. What
was the height of the helicopter when the ball
was dropped?

m

e. If the height of the helicopter was 160 m,
how long will it take for the ball to hit the
ground?

s

3. Mike threw a baseball with an initial velocity
of 80 km/h (22.22 m/s) with an angle of 30 degrees.
Assume that the ball was released at the height of 1
m.

a. What is the velocity of the ball on x
direction when the ball was released?

m/s

b. What is the velocity of the ball on y
direction when the ball was released?

m/s

c. How long will it take for the ball to hit
the ground?

s

d. How far has the ball traveled when it hit
the ground?