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  1. C

    Average speed of a particle

    Homework Statement The position of a particle as a function of time is given by x = (-5.06 m/s)t + (3.05 m/s2)t2. Calculate the average velocity of the particle from t = 0 to t = 1.20 s. -1.40 m/s (this is correct, from my calculations) 2nd part: Calculate the average speed from t = 0 to...
  2. C

    Free falling object

    Homework Statement A ball, dropped from rest, covers three-fifths of the distance to the ground in the last second of its fall. From what height was the ball dropped? The Attempt at a Solution I have spent the past thirty minutes attempting to figure this out. I initially used a kinematic...
  3. C

    Question concerning initial velocity

    Homework Statement An athlete executing a long jump leaves the ground at a 31.6° angle and travels 7.78 m. What was the take-off speed? I have tried to solve this question but somehow keep arriving at the wrong answer. The formula that I derived is : distance=V(initial)*sin^2(theta)/g...