Unit 2: Practice Problems

A dolphin swims 1.85 km/h. How far has the dolphin traveled after 0.60 h?

1.1 km

A race car accelerates from 0 m/s to 30.0 m/s with a displacement of 45.0 m. What is the vehicle's acceleration?

10.0 m/s^2

A sports car accelerates at a constant rate from rest to a speed of 27.8 m/s in 8.00 s. What is the displacement of the sports car in this time interval?

111 m

A toy car is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s^2. What is the final velocity after 6.0 s?

17 m/s

A marble accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What is the average velocity of the marble?

2.2 m/s

A hiker travels south along a straight path for 1.5 h with an average velocity of 0.75 km/h, then travels south for 2.5 h with an average velocity of 0.90 km/h. What is the hiker's displacement for the total trip?

3.4 km to the south

A shopping cart given an initial velocity of 2.0 m/s undergoes a constant accelertaio0n of 3.0 m/s^2. What is the magnitude of the cart's displacement after the first 4.0 s of its motion?

32 m

A soccer ball is kicked horizontally. What is its average speed if its displacement is 21.0 m after 4.00 s?

5.25 m/s