Free Fall

Acceleration due to gravity is equal to...

• 4.91 m/s²

• 8.76 m/s²

• 9.81 m/s²

• 19.62 m/s²

When an object is thrown in the air, what is its velocity at the max height?

• -9.81 m/s

• 0 m/s

• 9.81 m/s

• 10 m/s

If an object is thrown into the air with a velocity of +7.6 m/s what will its velocity be when it returns to the same height?

• -9.81 m/s

• -7.6 m/s

• 0 m/s

• 7.6 m/s

 A construction worker accidentally drops a brick from a high scaffold. What is the velocity of the brick after 4.0 s? Assume that downward is negative.

• +39 m/s

• -39 m/s

• +2.45 m/s

• -2.45 m/s

 A construction worker accidentally drops a brick from a high scaffold. If it is in the air for 4.0 s, how far did it fall?

• 78 m

• 44 m

• 39 m

• 19.6 m

A tennis ball is thrown straight up with an initial speed of 22.5 m/s. How high does it rise? Assume downward is negative.

• 1.15 m

• 4.59 m

• 26 m

• 103 m

A tennis ball is thrown straight up with an initial speed of 22.5 m/s. How long does it take to reach its max height? Assume downward is negative.

• 0.44 s

• 2.3 s

• 221 s