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4. A drop of oil falls down onto the road from the engine of a moving car every 5 s. Motion is leftwards. Left direction is positive. The figure below shows the patten of the drops left behind on the pavement. a) What is the average speed/ average velocity of the car over this section of its motion? b) Is the acceleration positive, negative, or zero? 600 m

4. A drop of oil falls down onto the road from the engine of a moving car every 5 s. Motion is leftwards. Left direction is positive. The figure below shows the patten of the drops left behind on the pavement. a) What is the average speed/ average velocity of the car over this section of its motion? b) Is the acceleration positive, negative, or zero? 600 m

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4. A drop of oil falls down onto the road from the engine of a moving car every 5 s. Motion is leftwards. Left direction is positive. The figure below shows the pattern of the drops left behind on the pavement. a) What is the average speed/ average velocity of the car over this section of its motion? b) Is the acceleration positive, negative, or zero? 600 m 5. Ali throws a stone vertically upward from rest and then the ball falls down on the ground as seen in the sketch below (Notice the sign convention in the sketch). For the key points A, B,C, D shown, indicate whether the position (y), velocity (v), and acceleration (a) are positive, negative, or zero. A: Immediately after the stone leaves Ali's hand. B: The topmost position. C: At the level of Ali's hand on the way down. D: Immediately before the stone hits the ground. +y -4 >
Transcribed Image Text:4. A drop of oil falls down onto the road from the engine of a moving car every 5 s. Motion is leftwards. Left direction is positive. The figure below shows the pattern of the drops left behind on the pavement. a) What is the average speed/ average velocity of the car over this section of its motion? b) Is the acceleration positive, negative, or zero? 600 m 5. Ali throws a stone vertically upward from rest and then the ball falls down on the ground as seen in the sketch below (Notice the sign convention in the sketch). For the key points A, B,C, D shown, indicate whether the position (y), velocity (v), and acceleration (a) are positive, negative, or zero. A: Immediately after the stone leaves Ali's hand. B: The topmost position. C: At the level of Ali's hand on the way down. D: Immediately before the stone hits the ground. +y -4 >
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