# What happens to the speed and acceleration of this

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2. What happens to the speed and acceleration of this ball as it is rolling down this curved hill? A. Both the speed and acceleration are constant. B. Both the speed and acceleration are increasing. C. The speed is decreasing, but the acceleration is increasing. D. The speed is increasing, but the acceleration is constant. E. The speed is increasing, but the acceleration is decreasing.
3. Leroy, who has a mass of 100 kg, is skateboarding at 9.0 m/s when he smacks into a brick wall and comes to a dead stop in 0.3 s. What is the average force of impact on Leroy during this collision?
4. The drawing shows top views of three motorboats crossing a river. All have the same speed relative to the water, but are pointing in different directions, as shown by the longer arrows. All boats experience the same river flow, as shown by the shorter arrows. Which boat has the largest speed relative to the shore?
5. An apple falls, not far from a tree. As the apple is falling, which of the following statements is true?
6. A bag of groceries weighs 40 N. What is required in order to lift the bag a distance of 2 m upward? A. The bag must do about 20 Joules of work on you. B. You must apply a net force of about 20 Newtons to the bag. C. You must apply a net force of about 80 Newtons to the bag. D. You must do about 20 Joules of work on the bag. E. You must do about 80 Joules of work on the bag.
7. A ruler is 30 cm long, and has a mass of 40 g. There are 4 washers stacked in a pile on the 0 cm mark. Each washer has a mass of 10 g. At what point should you place a pivot under the ruler to balance the ruler and washers?
8. A solid glass ball has a mass of 1 kg. What is the mass of a solid glass ball with twice the diameter?
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