Bennett Mechanical Test Velocity and Gravity 2

Question 1

A ball is dropped from rest. Approximately how fast is it falling after 3 seconds (ignoring air resistance)?

Accepted Answer

About 30 m/s

Answer

Velocity equals g times time, so 9.8 m/s² × 3 s ≈ 30 m/s.

Question 2

Two balls of different mass are dropped together in a vacuum. Which hits the ground first?

Accepted Answer

They land at the same time

Answer

In a vacuum all objects fall at the same rate regardless of mass.

Question 3

What is the difference between speed and velocity?

Accepted Answer

Velocity includes direction, speed does not

Answer

Velocity is a vector with magnitude and direction, while speed is only magnitude.

Question 4

A car travels 100 meters in 5 seconds at constant speed. What is its velocity?

Accepted Answer

20 m/s

Answer

Velocity equals distance divided by time, 100 m ÷ 5 s = 20 m/s.

Question 5

An object thrown straight up has what velocity at the highest point of its path?

Accepted Answer

Zero velocity

Answer

At the peak the object momentarily stops before gravity pulls it back down.

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