9. A helicopter travelling horizontally at 50.0 m/s [W] turns steadily, so that after 45.0 s, its velocity is 35.0 m/s [S]. Calculate the average acceleration of the helicopter. A 10. A ball on a pool table bounces off the rail (side), as shown in Figure 5. The ball is in contact with the rail for 3.2 ms. Determine the average acceleration of the ball. 25 8.2 m/s 8.2 m/s
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- 85. A plane travels N30°W at 450 mph and encounters a wind blowing due west at 30 mph. (See Example 9) a. Express the velocity of the plane v, relative to the air in terms of i and j. b. Express the velocity of the wind vw in terms of i and j. c. Express the true velocity of the plane v, in terms of i and j and find the true speed of the plane.4. There are two frogs named Eroggy and Jumpy. They jumped from the top of a vertical cliff. Froggy just drops and reaches the ground in 3.50 s, while Jumpy jumps horizontally ((bida bida siya, char! Hahall with an initial speed 95 cm/s. a. How far from the base of the cliff will Jumpy hit the ground? b. How high is the vertical cliff? c. If Jumpy jumps with an angle of 30 degrees with respect to the horizontal, what should be its initial velocity for it to land on the same spot as he did when he jumped horizontally?A ball is thrown horizontally from a height of 1 m and lands 5 m away. a. What is the time of flight of the ball? b. What is the initial velocity of the ball?
- 9. A boy wishes to throw a ball over a flat roofed school house that stands 12 m wide and 7.5 m high on level ground. Assuming that the ball will leave his hand at a height of 1.5 m above the ground, determine how far from the wall he should take his stand in order to make the ball clear the roof with least effort, that is, with minimum initial velocity. A. 4.4 m B. 2.1 m C. 7.4 m D. 8.1 mOn planet #3, you fire a projectile horizontally from the edge of a vertical cliff 69.9 m above the ground, with an initial speed of 59.8 m/s. The projectile lands 67.2 m away from the base of the cliff. What is the value of g for planet #3? a. 183.63 m/s^2 b. 110.71 m/s^2 c. 55.35 m/s^2 d. 49.18 m/s^2 2. On planet #4, you fire a projectile from the ground at an initial speed of 20.0 m/s at an angle of 43.1 degrees above the horizontal. The projectile lands 78.7 m away from the launch point. What is the value of g for planet #4? a. 3.5 m/s^2 b. 309.0 m/s^2 c. 211.6 m/s^2 d. 5.1 m/s^2A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70cm as she throws. She releases the javelin 2.0m above the ground traveling at an angle of 30° above the horizontal. In this throw, the javelin hits the ground 62m away. a. What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration. b. What is the speed of the javelin as it leaves the hand of the thrower? c. What is the maximum height reached by the javelin? O 10.5m 9.8m O 8.5m O 7.0m
- 12. A ball is thrown straight up into the air. At each of the following instants, is the magnitude of the ball's acceleration greater than g, equal to g, less than g, or 0? Explain. a. Just after leaving your hand. b. At the very top (maximum height). 6. Just before hitting the ground.. A stone is thrown from level zero at 30° above horizontal. It lands at the same level 20 m away.a. What is the initial speed of the stone?b. What is the maximum height that it reaches during the flight?c. How long does the whole flight take?A kangaroo can jump over an object 2.7 m high. a. Calculate its vertical speed when it leaves the ground, in meters per second. b. How many seconds is it in the air?
- I see that an object has is decelerating, what does this tell me about A? A. Nothing at all, what i see has nothing to do with A B. A is a positive C. A is a negative D. A could be either, depending on the direction of the velocity Can I do the vertical part of a projectile motion problem separately from the horizontal part? A. Always. Horizontal motion is completely separate from vertical motion though they share time B. Never. C. Only under very special circumstancesB. Critical Thinking. Answer the following items.Include a picture or description of your coordinate system (origin, positive direction).