Give an example of vertical motion with a positive velocity and a negative acceleration?
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Give an example of vertical motion with a positive velocity and a negative acceleration?
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- A punter kicks a ball at an angle of 75 degrees with an initial velocity of 15 m/s. What is the maximum height of the ball? (Assume his foot hits the ball 1 meter above the ground). Include a drawing and all steps. Use the projectile motion equations.A projectile is fired from a gun and has an initial vertical velocity equal to 30 m/s. What is the acceleration of the projectile when it reaches its maximum height? Its magnitude is 9.8 m/s2 and; its direction is changing. 9.8 m/s?, downward O m/s2 less than 9.8 m/s-but non-zero. 4.9 mm/s?, downwardA ball was thrown from the ground at an angle of 28 degrees with the horizontal with an initial speed of 19 m/s. Calculate the highest distance it can reach.
- The maximum horizontal distance a boy can throw a ball is 50 m. Assume he can throw with the same initial speed at all angles. How high does he throw the ball when he throws it straight upward?How long does it take for an object thrown straight up in the air with the velocity a 50 M/S to reach the peak of its path?An object is thrown vertically and has an upward velocity of 9 m/s when it reaches 1/6 of its maximum height above its launch point. What is the maximum height of the object?
- A cargo helicopter, descending steadily at a speed of 3.8 m/s, releases a small package. Let upward be the positive direction for this problem. (a) If the package is 94 m above the ground when it is dropped, how long does it take for the package to reach the ground? (a) What is the initial velocity of the package? How does it compare to that of the helicopter? What is its sign? What about the magnitude and sign of the acceleration? s(b) What is its velocity just before it lands? (Indicate the direction with the sign of your answer.)A red ball is thrown down with an initial speed of 1.1 m/s from a height of 28 meters above the ground. Then, 0.5 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.3 m/s, from a height of 0.9 meters above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s?.