Physics 20: SUMMER Assignment 1 Unit A Module 1, Lesson 2: The Language of Motion - Displacement, Velocity, and Acceleration Lesson 2 of this assignment is worth 12 marks. The value of each question is noted in the left margin in parentheses. 8. A ball is moved from the initial to the final positions below. Calculate the displacement (magnitude and direction) of the ball. Express your direction in polar positive notation and show all work. Initial position: (x;, yi) = (+15.0, -20.0)m Final position: (x5, yf) = (-10.0, -15.0)m (4)Physics 20: SUMMER Assignment 1 9. a. If an objects acceleration and velocity are in the same direction, will the object be speeding up, slowing down, or maintaining a constant speed? (1) b. If an object's acceleration and velocity are in opposite directions, will the object be speeding up, slowing down, or maintaining a constant speed? (1) 10. An eraser is thrown from a hand directly upwards. (Hint: Review textbook pages 58-59 if needed. (2) a) Fill in the blank with the correct term: In the instant the eraser leaves the hand, the velocity of the eraser is in the (upward/downward) direction and the acceleration of the eraser is in the (upward/downward) direction.b] During its motion {after it leaves the hand and before it returns], does the eraser ever have an instantaneous velocity of zero? Explain. c} During its motion {after it leaves the hand and before it returns], does the eraser ever have an acceleration of zero? Explain. 11. If you slam on the breaks at a red light, could your acceleration be positive? Explain why or why not