final exam physics

What is velocity?

• The total distance traveled by an object
• The distance from start to end, including the direction
• How fast an object travels
• The speed at which an object travels plus its direction

A dolphin can swim 1.85 km/h. How are far does the dolphin travel after 0.6 hours?

• 0.63 km
• 1.1 km
• 2.5 km
• 3.7 km

A trucker drives with an average velocity of 27 m/s towards the east on a perfectly straight highway. What will the trucker's displacement be after 2 minutes?

• 97 m; east

• 190 m; east

• 1600 m; east

• 3200 m; east

What is acceleration?

• It is the displacement.
• It is the velocity.
• It is the rate of change of the displacement.
• It is the rate of change of the velocity.

Which of the following is NOT a valid unit for acceleration?

• m/s/s
• m/s²
• km/hr/sec
• km/hr

What happens to an object's motion when the velocity is positive and the acceleration is negative?

• The object slows down.
• The object speeds up.
• The object remains at a constant velocity.
• The object remains at rest.

A race car accelerates from 0 m/s to 30 m/s with a 45 m displacement. What is the vehicle's acceleration?

• 2 m/s²
• 5 m/s²
• 10 m/s²
• 15 m/s²

A curious kitten taps a ball of yarn at rest with its paw, displacing the ball of yarn 1.75 cm in 2 seconds. What is the acceleration of the ball of yarn?

• 11 cm/s²
• 8.75 cm/s²
• 14.4 cm/s²
• 18.8 cm/s²

Which of the following units are used to measure free fall?

• m/s
• m/s²
• m*s
• m²/s²

Which of the following is a value for the acceleration of objects in free fall?

• 4.905 m/s²
• -4.905 m/s²
• 9.81 m/s²
• -9.81 m/s²